The only game that doesn't do so great on my 2001fp is UT. It's still playable but the action is so fast and frenetic that it can't quite keep up. Everything else works perfectly....Doom 3, HL 2, Tiger Woods, Pirates, etc. And the monitor interpolates real well.
It's alright. But going from a CRT to this thing, the delay is bad. Mostly when trying to keep crosshairs on someone when turning and jumping. Not real clear. It's a beautiful 20", but it's nowhere near perfect for gaming.
Guess it's a matter of opinion.
I'll tell you what, it sure doesn't make my room hot like the CRT did. It's definately got it's advantages.
I'll probably pick up the 22" NEC/Mitsu CRT and keep this for a dual setup.