So far so good. For something that's still in closed Beta (but without an NDA (*phew*)) I have to say it is amazingly stable and a damn good product. I'm keen to see it with some of the wizz-bang graphics options turned on, but I imagine that the client would have been HUGE with higher rez textures.
There are add-ons already hitting the interwebz on Curse. It would be good if the WoWAce community jumped on the band wagon and started putting up a development framework "to rule them all".
i second that, i have been playing the preview weekend and the game is awesome, just needs more ACE'age in it :)
thanks for the great work everyone has put into ACE, my WoW experience would never have been the same without it!