Just took delivery of a U2312HM yesterday and pretty happy with it so far. The viewing angles maybe aren't quite as good as my old Dell 2007WFP, in that there's a little whitenning in the extreme corners of the screen sometimes, but you only see that if the screen content is very dark, other than that the screen seems problem free.
The AR coating doesn't really bother me, it's the sort of thing you only notice on large blocks on light colours, like if you use office, or art packages, but in gaming I certainly never notice it. TBH the coating was more noticeable on the 2007WFP. After reading this thread I was expecting it to be a lot worse.
Only other thing worth mentioning, black depth and near black detail still isn't quite where I'd want it for gaming in a dark room, but this only affects a very small number of games, stuff like Doom 3, Thief etc.
The really good thing, coming from a TN screen, I can get even colours over the whole screen now (rather than a vertical gradient), and a great looking picture.