Got mine on Friday but haven't had a chance to really use it until today. Definitely a HUGE difference in resolution versus my 27" 1080p display. 60hz is proving really hard to get used to after using 120hz for years. I'm adjusting but it just seems like the mouse cursor is moving through quicksand.
Gaming-wise, I don't detect any input lag (using Advanced response setting). Maybe I just don't notice input lag that much but it doesn't feel any different than my VG278HE in that regard. The movement definitely feels "slower" though due to the lower refresh rate. I went 16-3 in the BF3 round that I played so at least I don't feel too much like my previous monitor was giving me too much of an advantage
The graphics look MUCH better though, everything is so sharp, no more jagged edges. I can't wait to play some more games and see how much better they look.
The anti-glare coating is also pretty amazing. I also have an NEC EA231WMi and the coating on this is WAY better, it isn't even close.
Backlighting is pretty good, though it seems like I have a blob in the lower left that is tinted yellow. It's pretty faint but I keep noticing it, especially on white backgrounds, which I use a lot of (Visual Studio). Hopefully I'll get to a point where I can ignore it.