Well.. someone needs to do some thorough testing with other cards.. and see if its consistant to some extent...
I did mention about quality and performance setting in Rivatuner (which it looks like you have deleted).. and frankly I'd use performance judging by the performance associated with it.
I also said something about the slider.. the further left would decrease performance.. though, I didn't say was that it in theory, it should improve IQ
I'll never use aggessive mode though...
I'm still wondering what are the best setttings for my GF3... application-2x aniso (performance aniso via rivatuner) or quality-2x aniso... I'm not really one to pay attention to jaggies too much (unless its rather obvious)