It works great in opensuse 11.1 amd64/kde 4.2.1, and not so great in kubuntu 8.10 32b (kde4.2x) on the same hw (x2 4850e/2G/9550-128MB); if I enable effects it is unusably slow on kubuntu (otherwise it works as good as whatever fglrx was in the 'buntu repos). I'm not sure whether its compiz or kwin in both/either distro though, and I did spend a little more time and attention on tweaks for suse.