Loving OA. With the combined version I have been waging an all out war in the editor. (especially with some good addons). I really like the Takistan army and the premise of the whole situation. Played through the first two missions of the campaign and loved them, there not boring like Harvest Red was (i didn't even want to finish it). Sound is been upgraded too. Most guns are the same but vehicles sound much better.
FLIR is awesome, I love having it in the Bradleys and M1A2s. BIS really hit this one out of the park.
Performance wise, Takistan is mostly like Chernarus for me, which is decent/playable. I was hoping for bigger performance increase though. Zargabad actually is smoother than Takistan for me, which is cool.
I'll be stuck in the editor playing with all the new toys! (too many that I love to list).
So far I've seen no game-braking bugs or anything really noticable, AI actually use buildings and Medics actually get to you before you die! Only thing I wish was fixed is that when you are in a turrent all the sounds are muffled like you are actually inside a vehicle, but your really not.
This is awesome.