I've updated Komplete Ultimate religiously since Komplete 8, albeit always when it was on sale. When I first started out in music production and pretty much knew that it wasn't going to be a short lived hobby, I figured it was the most bang for my buck in terms of what you get, and to be honest, I still think it's great value. But recently certain niggling annoyances about their stuff as a whole have come to a head with me. 
 
The problem I have with them in is their synth and effects products. Their sample libraries are great, I have no trouble with them. But so much of their synths and effects are just plain goofy, by which I mean stupidly over-complicated and terribly documented. The upshot is that unless you have a phd in physics you're very unlikely to understand what in the hell is going on, and you're never going to fully master them. 
 
In addition to this, their presets are goddamn awful, let's face it. I have this beef with a lot of soft synth manufacturers but NI really seems to lead the pack in terms of unmusical, unusable presets that you're just never ever going to want to incorporate in a track, even if you're an EDM producer. I know presets are partly there to show off what the synth is capable of, but come on, you have to have a solid core of usable sounds that have stood the test of time and are useful as foundations to tweak into your own variations. Going through the presets on most NI synths I'm just irritated as hell, and this really became clear to me when I installed Komplete Ultimate 10 and took synths like Rounds and Kontour for a test spin. The presets are just horrible, 99% of them have no musical use whatsoever and seem to be a demonstration of some synth nerd's technical skills more than anything. 
 
Which I wouldn't mind if these synths were intuitive, but they're not. I mean come on, does anyone really understand Prism? It's a great sounding synth (and actually has a handful of half decent sounding presets) but the fact that Groove3 (or anyone else) has never released a video course on it speaks volumes. Nobody knows what in the hell is going on! I once sat down with the manual, determined that I'd learn how it works no matter how long it took me. After a couple of readings I still didn't understand. Same thing with Spark - it's like some convoluted science project with a manual written by someone who hates people and doesn't get out much. No video course for that either. You'd think Native Instruments would release a good set of videos to go along with these instruments, but no - the most you'll ever get out of them is a cheesy 2 minute video with some irritating dubstep music which leaves you none the wiser. 
 
The manuals are so bad I would consider it grounds for a refund. Take Molekular, the "revolutionary" new modular effect unit they rave so much about. It has a lot of wacky effect modules that you'll probably never, ever want to use in a track because they just don't seem to produce anything approaching a musical sound. So why would you ever want to chain 4 of them together, cross modulating everything in their path? Let's say you want to learn about the "Plagiarism" effect. Here's NI's explanation in the manual: 
 

"The input signal’s amplitude is measured using an envelope follower. The measured RMS data
is used to trigger 16 envelopes, which in turn are used to play back 16 “voices.” The voices
are commonly switched between bandpass, sine-wave, or pulse-wave modes. The pitch or center
frequency of each voice is generated from a base pitch plus per-voice offset that is read
from a look-up table with various interval sequences. For example, the 16 voices can be configured
to play the base pitch and its first 15 harmonics as sine waves. In pulse-wave mode,
the envelope is additionally used to modulate pulse width."
 

Totally understandable right? You totally know where you are from that. 
 
But this is how all of their manuals are written. If you want to learn Spark, or Kontour, or Rounds, that's the kind of blurb you're going to have to slog through - page after page of it. I consider myself reasonably intelligent and know the basics of synthesis and even like a challenge - but come on Native Instruments, have you ever thought about getting a normal, socially functioning person to write your manuals? 
 
Rounds is an interesting sounding synth but the interface seems badly designed and NOT conducive to creativity. Very convoluted workflow and functionality. Now FM8, that's a great synth with a great interface. Monark - can't go wrong with what are basically MiniMoog controls. But this is Native Instruments emulating classic synths that have already been designed for them, and giving them a modern interface. Their other stuff is starting to get on my nerves, and I'm starting to wonder why in the hell I'm paying for so much stuff which is ultimately unmusical and baffling. Rant over! I'll probably give it all another go tomorrow like I always do 
 
 

DUDE!!!  Word!!!
 
I bought into K7 then to 9 just for Kontakt... early on I realized all the rest of the stuff paled in comparison to Uhe, Alchemy, and many others...crappy presets, lousy manuals, sound...meh?   I got pissed really quick, but the upgrades to stay current with Kontakt...99 bucks...have been ok... the best thing NI has goin' is Kontakt... because every one ELSE develops for it.  Never went for the bigger brother as I didn't like it's sibling...
 
The ONLY thing I use is Kontakt, cept for a bit of Guitar Rig.   All the good stuff they include, like the heavyocity stuff... I already own... and the orchestral stuff I bought I'm still kickin' myself for... really tacky compared to others...
 
BTW, Plug in Guru has some decent vids on FM8 but that's about it... oh, Razor too...and Absynth and that other one I don't use... 

Ya I think their new Reaktor synths tend to be silly. I do like their older synths though, FM8 and Massive are both very nice IMO and Massive is pretty easy to use.
 
Thing with Komplete (and Ultimate even more) is you just have to know you are buying in to a lot of crap you don't want. So figure out if the stuff you do is worth the bundle price. I decided it was. Of the stuff in K9U (I didn't bother to upgrade to 10) it broke down for me like this:
 
Really want: Kontakt, the pianos, the basses ($1050)
Would like: FM8, Massive, Mark I, Battery, Guitar Rig, Reverb Classics, Session Strings ($1070)
Don't care: The rest of it.
 
Made it a no-brainer really. I needed Kontakt because I wanted full Kontakt libraries. That would be $250 (crossgrade since I had some play libraries). So if I was going to spend $250 or more on other libraries, then Komplete would be worth it. I decided I would, since at a minimum I wanted one of their pianios and basses and that would be $200 right there. I didn't get ultimate right away, but when it was on sale for $250 upgrade, I decided that was plenty worth the extra.
 
I have a lot of junk I don't install, Damage, Action Strings, all the drums, etc, and then junk I installed but don't use, like Reaktor. However it was worth it for what I did want.
 
Always the issue with big bundles: They are almost never going to be 100% things you want. So you just have to throw math at it and see if it'll be worth it.
 
Given the amount o' stuff they cram in Komplete and the fact that it is only $250 more than Kontakt if you have a library already (and $100 more if not) it is nearly always worth it.
 
Just ditch the Reaktor crap, and give Massive and FM8 a try. I still usually use Synthmaster, but I like them. In particular Massive does better synth strings IMO.

Reaktor has some incredibly powerful synth-building features, as well as a bunch of really nice included synths and presets.
 
I was able to faithfully reproduce Baba O'Reilly intro REALLY close to perfect, and the same for Won't Get Fooled Again's organ and the Seconds Out Genesis Firth of Fifth keyboard solo sound.
 
I have zero use for Massive or Absynth, just because I don't do those evolving soundscape kinds of sounds.
 
FM8 has some brilliant c\sounds and capabilities, AND I found a freely available gigantic set of DX* EVERYTHING (DX7, DX9, TX816, GS1, you name it anything Yama DX-type technology) presets that are converted for FM8 use.  I am talking TENS OF THOUSANDS of presets, plus FM8 can directly read any of the DX* sysex info so you can find and use any of those kinds of banks out on the web and instantly directly USE them in FM8.
 
Battery 3 is also quite used by me, as are Kontakt and Guitar Rig.
 
Bob Bone
 

Yeah...  I've gotten use out of just about everything in K9.   Except for the FX - I just never seem to use those.    But synth-wise there isn't much I haven't used at least once or twice (or more).   Granted, I don't create patches from scratch but rather tweak presets.  
 
Then again, are there any deep/cutting edge synths that aren't somewhat obtuse?   I don't own and use much outside of K9, but one synth I do have and use is Loom from AIR.  It's additive and I really like it, but it aint overly intuitive. 

To be honest I dont think they expect most users will try to understand how to program some of these newer Reaktor based synths. I think the general idea is you mess with a preset and hope for a happy accident. I started out with analogue synths like the EMS Synthi A so I can get the sound I want reasonably quickley fron an traditional analogue synth but have to rely on trial and error with some modern soft synths.
 
I like Kontour a lot, Rounds on the other hand is a bit of a mystery. Prism is capable of some pretty unique sounds but it remains virtualy unused by me, I am not sure why. I am not sure about Spark either.
 
The Mouth and finger are fun but I am not sure how to integrate them into the type of music I want to make. That may be down to a lack of imagination on my part.
 
Monark is superb, but there are several really good Mini Moog emulations out there. Minimonsta is my goto, its probably less authentic than Monark but I like the extra features.
 
I have never used FM8 in anger, I think I had my fill of FM in the 80's and 90's with hardware Yamaha synths.
 
Massive gets used occasionally. There are some nice leads and basses as starting points and tweaking is reasonably straight forward.
 
Absynth I am glad to have even though it only gets used occasionally. The mutate feature is the ultimate happy accident generator.
 
I keep thinking I should learn to create my own Reaktor ensembles. But then again I will probably get some wood and build another mountain dulcimer instead. 
 
 
 

I have Kontakt with a ton of third party sounds, FM8 with a ton of DX/TX presets and B4II.  This is all I need from NI. 

Reaktor is for synth builders. It's not surprising that people who buy just for preset sounds are baffled by it.

It's probably the only synth your will ever need assuming you have time to learn it as it is a huge mother. Have a read of the manual and I'll see you in 2016. Those who aren't downing the NI community contributions for it are missing out. Definitely want Reaktor 6 but waiting at least until K11, but then again K11 better be really special otherwise I'm sticking to K9.

IMHO NI synths cannot be learned overnight and can take years to get a grip of. Therefore there is no point in upgrading for several years, otherwise you might just be walking around in a huge candy factory, and buying another one before you've barely explored the first. If you want just presets best go for cheaper synths such as z3TA+2 for instance (assuming one day they fix the bugs).

Don't get me wrong, I still think Komplete is good value for money for the things I DO like about it, i.e. Kontakt and included libraries, FM8, Massive (yes an excellent synth with a very well designed interface), Monark, Battery and some of the Reaktor stuff. And yes some of the Reaktor User Library stuff is amazing, some great sounding free synths there like Eccentrix. And I'm not saying their newer synths are bad sounding per se, it's just the way they package their stuff, i.e. horrible presets and terrible documentation. When I compare, for example, the Geist manual with the manual for any NI synth, it's like night and day. The difference between someone who really knows how to introduce a new user to a new product, and someone who figures they'll just collect all of their nerdy development notes into a PDF and call it a day. This stuff could be great, but they don't want to help you get to grips with it.

Reaktor, yes I know, very powerful tool, but again the documentation kind of presumes you already have a strong overview on how it all works, it's more like a reference manual than anything. How about some online tutorials? Adobe, for example, provides a lot of baby-step lessons for new users. NI could be doing a lot more toward getting beginners up and running with synth building in Reaktor instead of forcing them into buying third party lessons (which like NI's own documentation, aren't that great for beginners.) I've tried reading the Reaktor manual but never really got anywhere with synth building because they don't really explain the basic philosophies and practices of Reaktor well enough to give you enough confidence to understand what the hell they're going on about later. I had the same experience with programming manuals when I learned C some years ago. Some of them were brilliantly written and knew exactly what sort of questions the beginner would be asking, others were seemingly written by a nerd who seemed irritated by the fact that beginners existed in the first place. NI manuals fall into the latter category.

A lot of the new NI products are not made by NI.
 
The does not really excuse them for lack of documentation etc just sort of works that way.
 
the effects are by softtube guys (I think, maybe it's someone else).  the reactor ensembles are by a different 3rd party.  the new orchestral stuff by another 3rd party.  all the Maschine packs  are not made by NI.
 
I don't think Reactor was written by NI originally I thought NI bought it from someone or had someone build it for NI.  it's NI now.
 
I think the lack of documentation or good documentation comes from buying a product outright slapping the NI name and brand on it and slapping it out the door.  dunno if NI really know how to use it or document some of the stuff they have.
 
doesn't really excuse it.  just because I know this, sometimes when I am diving into a NI product or NI manual I sometimes have the ahhhhh ha, written by someone else moment.
 
Groove3.com is a good place for NI product tutorial vids, there are a tone out there if you hunt for better information than the documentation or manuals that come from NI.  just saying.