I don't like them.
My favorite game is 1942. Usually drivers are just too fast for the game, if that makes any sense, so I just enable some candy in the driver CP and the game runs like glass; however, no matter what I did the drivers seem sticky, unpolished. I tried no AF, 4xAF, 4xAF with 2xAA/4xAA. 8xAF, 8xAF with 2xAA/4xAA... no combination of candy would make 42 run smoothly, which was odd considering these things are supposed to be 80% faster?
I thought it might be the game, or the server, so I tried CoD4... same thing. The odd thing is that single player stuff runs just fine, nice and smooth... but... SP is not my thing.
***EDIT***
Ok, the magic number now seems to be 16x. I guess they are faster? Too tired to play anymore today (who said that!), so I'll try some more games tomorrow.