Okay, just started testing and I can tell you that the response time isn't that of a CRT monitor... I can notice a little blurriness/ghosting if I change my perspective very rapidly while playing City of Heros. It's tolorable... so if I hadn't been playing on a CRT, I might not even notice. It's not perfect, but it's pretty nice. I work on my laptop a lot, so I'm surprised at the adjustment I'm having to make going from my old CRT monitor!
I'm not sure I'm sold on this monitor yet. I think I got a pretty good deal on it with the rebates, so I might hang onto it. I've got two weeks to make a decision... one nice thing about buying your items from Best Buy (as opposed to Circuit City, who will charge a restocking fee if you return a computer item.