I don't think i'd ever use it in CSS, racing games, flight sims, maybe some RTS games? it could be good in though and add a new level of depth to the games, but i found playing GRID with a single 5870 it felt sluggish, FPS was ok, but the game actually felt like it was chugging a bit in it's responsivness towards inputs
And i agree about the BenQs, the reason i bought the Dell was because i was so disapointed by the colour quality, previously i had a Hyundai W240D and while the colour wasn't bad i never seen it as brilliant, thought the BenQs would be a step up....i was very wrong (both the Hyundai and BenQ are TN panels, wouldn't of thought there would be much difference)