After listening to all of them closely, I decided to get a bit of variety and liked the sounds of these:
 
AdPacks:
1) Fairfax 2
2) Reel Machines
3) Vintage Dry
 
MidiPacks:
Rock Songs
Percussion Beats
Blues (coz I luvz da bluez :))
 
I can't remember which kits I got, but I think they're the congas, picolo snare, & the big bass (purple drum)).
 
 
Of note, I use the Percussion Beats midi with other drum kits (i.e Reel Machine/Fairfax2) and it's really fantastic, easy to use stuff. Also, as someone else mentioned, the transform feature is very useful as well.
 
I want to get as many of their Adpacks as I can, but a bit broke atm........I'm ready to trade some of my Maschine Expansions or even other plugs as I'm totally Addicted to these drums.   

I had studio rock, prog and pop from ad1 to ad2 upgrade and had Metal and Session Percussion as well from earlier.
 
I had almost decided to stop using AD2 for several reasons but the Sonar trippelpack turned me back to it. I even purchased an additional artist bundle to round out the sets as I had a hard time deciding. New ones: Vintage, Black Velvet,  Jazz brushes, Blue Oyster and Fairfax 2.

Fairfax 2, Blue Oyster, Reel Machines + DW woofer BD and DW piccolo snare.
 
Loving the easy layering - my first frankenstein experiment is 808 BD layered with the DW woofer BD. 
 
 
 
 

I got the Jazz sticks & rushes and the Pop AD.
 
But what I really wanted was the MIDI stuff.  I tried to select that and got an error.  Now I can't select it at all.  So I have the drums, but not the MIDI material.  I sent a request for support and have heard zilch after 2 days.
 
On edit, XLN did respond.  The MIDI tracks actually were installed.  I was just confused.

dlesaux
Okay, I'm going to be the oddball here and say I've never even installed Addictive Drums. I use EZdrummer and didn't see the need to learn yet another program.  But it looks like I'm in the minority here!

You are not alone. EZD2 is brilliant but I will try some AD2 after building the patterns with EZ. AD2 offers an amazing amount of edits/tweaks.

Looking for variety, I got:
 
Black Velvet - Loud, Grunge, Rock
Studio Percussion - World, Dance, Funk
Reel Machines - Electronic , Dance, Pop, Rock
and the associated Midipaks - Loud, Percussion, Reel (recognising they can sound good with alternate kits).
 
I already had the Studio Pop, Prog, Rock from X3.
 
I figured I could get the Fairfax Bundle  (1&2) at a bundle/sale price (if the GAS levels rise). But whilst demoing they probably weren't even next on my list ... which was probably Vintage Dry. Is there a bad choice? Sound all pretty solid for their respective jobs/genres to me.
 
Still to choose my kitpieces.

Fairfax 1
Black Velvet (enjoying this one!)
Studio Percussion

Fairfax Vol.2, Jazz Sticks, and Session Percussion. 
I picked up the corresponding MIDIPAKS for these kits.

I keep wondering what they would do next, they seem to have covered most bases. I would be interested in a Hot Rods Kit and a Mallets kits. (as well as a stack of percussion Kit Pieces)

Went with Black Velvet, Studio Rock and Funk kits.
Black Velvet sounds pretty good.

I got Fairfax 1 when I upgraded to AD2, so this time I added Session Percussion, Jazz Brushes, and Vintage Dry.  I'd added the Dry Beats and Ballad Grooves midipaks during the half off sale. Since the perc and brushes midi were "required", I got the Reggae, too. I don't recall how/why I have the Pearl Masterworks piccolo snare, but I added the Bongoes, Timbau and Sangban. RE the Sangban, I thought I selected the Djembe, so I was disappointed by that. I can't imagine using it, but who knows!?!
    I have a couple more in mind, for when they go on sale, but haven't got to mess with any of these, yet, so some exploring is in order!
Michael
 
ps  Like Afrodrum, I thought the songs midipaks would be good to get, and the Latin/Afro one, too.
Anyone feel like Fairfax Vol2 is a really good expansion on Vol 1?      I love Vol 1., but wanted to cover more bases, first.

@ musicroom    Check out Platinum Samples Groove (midi) libraries. They have a video of how they show up in AD2
 
https://www.platinumsamples.com/index.php
 
At the bottom of the Real Country Groove library page, they scroll through the midi in AD2. It certainly seems easy.
http://www.platinumsamples.com/ps/RealCountry.php
 
Michael

A little bit of a tangent, I use Finale 2014 a lot.  It is really limited in the VSTs it can use.  I think it only can do 32-bit VSTs.  Just for fun, within Finale I scanned for VSTs after installing AD, and it found AD2.  That works great.  At the moment, I have set the "?" to General MIDI map so that all my existing parts in Finale will play reasonably.  But there are many more techniques available in the other maps.  This is definitely something I can use under Finale (and under Platinum too of course).  It is a big improvement over the minimal "standard" kits that are available in Garritan.  Even with my goofy drum patterns (not trying to be totally realistic), the drums actually sound pretty good.