I recorded the cello lines individually, for my test, trying to work with each library's strengths and weaknesses, and did a bit of minor tweaking for each one. I wanted to get the best out of them, without spending too much time. They all have limitations, but I found the EW one was the hardest to work with. Doesn't mean its a bad library, necessarily, as it might give great results after time is spent getting a feel for it and learning how it works. But it didn't make a great first impression.

 
Something definitely wrong there.  This is the Solo Cello Leg Slur.ewi with just each note held for 4 measures (at 120bpm).  The notes are B0 (silent), B1, B2, B3, B4, B5( silent).  I'm using the Sonar option Customization Display Base Octave for Pitches set to -2 (no clue how that maps).  The B0 note is the last note inside the Play player that is marked goldish/disabled (I just did all the B notes without looking what the lowest one it supported).  The B1 note is the first B note that has a tone inside Play.  That first B1 note has a major hiccup in it, sounds like a chair and some bow hitting something.  And B2 has a noticeable glitch in about the same spot.  You can see the glitches in RX4 very clearly.  And hear them.  Here's the project/Sonar screenshot:
 

 
Added: Here's the wav file in case you'd like to listen too
http://www.pontari.com/sonar/badcello.wav
 

msorrels
I wanted to expand my sample library to include a better full orchestra (I have the full IK Miro and a very old GPO).  After doing the math, I decided a year of CC was worth it.  It would let me exercise the new gear bug and help me work out what (if anything) I really wanted to buy.  Based on these first few weeks I now know a lot more about these sample libraries.  I'm also pretty sure unless they really step up I won't be renewing.  It was worth the money to me to learn these things (vs buying a library blind).  I also now have a deadline so I will focus harder on learning as much about these orchestra libraries as I can so I'll make a better decision on what to buy.  Plus I bought a year of time -- I fully expect competitor products to advance a bit before the end of the year.
 

Hollywood Strings and Hollywood Brass are among the best out there. The Storm Drums are great and Symphonic Orchestra in spite of being older is still really good. I also love the Gypsy Violin which was years ahead of everything else I tried. The thing with the Hollywood series is that they do require a bit more work than Symphonic Orchestra does but it can do much more than SO can. I love their older stuff but it seems the newer it is the less I like it. They have been passed by so many of their competitors at this point I wonder if they will ever find their footing again. They certainly stay alive on the bang for your buck though. If they had the subscription service way back when, I am sure I would have been sucked into it. But since I own most of their stuff it just doesn't make sense.

Hollywood itself is one of the most advanced and versatile orchestral libraries out there which is why I use it as much as I do. It does take a lot more work to make sound good (lots of CC editing) but because it lacks the out of the box sound and requires editing time, it's not limited to a particular sound which is what makes it one of the top dogs. That said, I can spend as much as 3x longer working on a project with Hollywood than I would with any other library which may or may not be unproductive considering most of the big libraries these days can give very similar results. Who knows.
 
I'm a bit jaded about the subscription thing because I bought a lot of the libraries when they first came out. Now that new libraries are coming and everyone can get access to them for a low monthly cost but it's not worth it to me to pay a subscription because of owning most of the EW catalogue already so I need to pay full price or wait for sales. It's one more way EW kicks their long time customers in the balls, IMO. I wouldn't be so bitter I think if people who bought libraries got them a year or more before they hit subscription but that won't happen.

I already owned Stormdrum 1 & 2 and the Plat Choirs, since the Kontakt days (and upgraded to the Play versions).  And I picked up Dark Side a few years ago at Halloween.  I was going to get (for many years) the Symphonic Orchestra, but then they started with the Hollywood series and the price jumped and it wasn't complete.  So I've just held off, but now that is finished seems like a good time to look at them seriously.  In hindsight perhaps I should have just bitten the bullet and gotten Albion 1/One.  But I now have a full year to play with both Gold Symphonic and Hollywood Gold.  I suspect I just don't need a high end orchestra.  I'm not that kind of composer really.
 
As long as users seem to believe things must be in continuous development, product developers are going to have to move more and more to reoccurring payments.  I don't really have a problem with it as much as most people.  It's a product, evaluate it on that basis (features/benefits/costs).  If it doesn't make sense for you, pass.  Anyone with a bunch of EW products isn't going to find value in the current Composer Cloud. 

 
I'm going to play the devils advocate here, and say that I own all of the E.W. libraries. The cello sounds that are in that library are about as exact as you can get, depending on what "you" are expecting to hear. An appropriate question at this point would be, how many of you are actually cellists. Do you know what you are supposed to be listening for, or are you interjecting what you "think" you should be hearing? Just asking ......... 

All I can say is compare EW's latest offering to say Embertone's Blakus Cello and there is no contest. I already said it's not that it sounds all that bad just not all that good either. Why spend major money on the EW cello (unless you are already on their cloud service) when you can spend far less on something that sounds better and you have more control over?

I record quite a bit of acoustic guitar in many of my pieces. In my mind, it sounds just like a guitar should sound. When I let real guitar players listen to it, they can find noticeable inconsistencies with the instrument sound, as it is being presented. So again I say, "do you know what you are supposed to be listening for, or are you interjecting what you "think" you should be hearing?". I have played many of the stringed instruments, from violin to bass, and as I see it the cello samples in E.W. solo collection sound remarkably authentic. I also suppose that this is all irrelevant. We are trying to get our music out of our minds and into the real world. Are we so occupied with the exact sound of a sample, or how the music imparts its soul into the listener? 
 
So much to do, and so little time to do it. I wish you all a pleasant day. 

You might want to hold your breath for Virharmonic's "Soul Capture" series cello, which is up for release this quarter... The first phase of their four phased introduction of the Bohemian Violin has... let's just say... blown everyone away, out of the water, into orgasmic ecstasy... and it's just a baby... but wildly heralded as the most playable instrument anyone has touched todate...
 
I for one will be waiting... tina won't compare; ew won't either... we're entering into a new age of playability and Vir has aptly named this new series.
 
many of us VICs have been captured...captivated... entranced... and enchanted ...
 
I guess I like it 

Vastman
You might want to hold your breath for Virharmonic's "Soul Capture" series cello, which is up for release this quarter... The first phase of their four phased introduction of the Bohemian Violin has... let's just say... blown everyone away, out of the water, into orgasmic ecstasy... and it's just a baby... but wildly heralded as the most playable instrument anyone has touched todate...
 
I for one will be waiting... tina won't compare; ew won't either... we're entering into a new age of playability and Vir has aptly named this new series.
 
many of us VICs have been captured...captivated... entranced... and enchanted ...
 
I guess I like it 

I've heard the same thing about their stuff. And the demos for Bohemian are awesome.