I've had mine since Jan. 3 and I absolutely love it. I'm never going back to tube monitors again after using this for a couple weeks. Everything is *crystal* clear...you'll know what I mean when you see it, I guess.
As for gaming, so far I've tried Return to Castle Wolfenstein, EverQuest, Civilization 3, and a few others. On RtCW, there was a bit of ghosting when turning, but it didn't bother me at all...and the extreme clarity I was getting when zooming in to snipe or just looking at something on the wall or the ground made it well worth it. In the slower-paced games it's like comparing a scratched-up LP or hissy tape to a CD...clear vs. just old-fashioned and analog, which pretty much sums up the monitor as a whole.
And, with all of Dell's specials, it's a bargain! $1334 vs. over $2000 on PriceWatch for almost any other 20" LCD? This is the one you want, believe me...
By the way, I'm using the DVI cable that came with it attached to a LeadTek geForce3 ti500. I haven't tried it with the standard VGA cable.