I get off, 2x, 2xQ, 4x, and 8x. If I go to 8x there are little glitches like every square icon on the AH clipboard looks rectangular. That only happens in 8x, so I avoid it. I'm testing new drivers at the moment. They seem to give slightly lower FPS, so I bumped it down to 2xQ, only I was seeing some odd things so I then bumped it down to 2x to see if there's a difference.
Under Detonator 84.66 I'd use 4x or off, off for testing skins and 4x for normal play.
With the new drivers I'm getting about 20-35 when I spawn on a runway. That's pretty low for this card. Normally I get mid 50s even in a big furball.
While it is a decent card, it's bottlenecked by 2 factors: 1) my 533MHz FSB P4 2.66GHz CPU and 2) My PCIe slot is only rated at 4x not 16x
Back on topic, the screenshots still show up without anti-aliasing, in 2x, 2xQ, and 4x. I'm noticing other things too that I don't like. I think it's just drivers being buggy. I'll probably go back to standard drivers when I'm done testing them.