Looking good for me except that googleearth crashes on startup:
Stacktrace from glibc:
Anyone else having this trouble? I'm running Ubuntu 10.4 and problem occurs whether or not Compiz is enabled.
OK the problem appears to be that I followed the Ubuntu binary driver howto which it appears missed something in the install. Not sure why only googleearth was affected as Stellarium was fine. Tried reinstalling Catalyst 10.6 via the method in the AMD instructions on the web site and googleearth is now happy.
My own reaction, running a 4850 with compositing enabled on a 1.6.5 Xorg server:
One DEFINITE improvement is found when switching workspace: I have 4, and at least 3 have many windows open in them at all time. In 10.4, switching to a full workspace could take up to 5 seconds. Now, it takes 1.
Resizing windows isn't extremely smooth yet (it may even leave artefacts behind), but it's definitely faster now.
Video Vsync still doesn't seem to work when compositing is active, but it's cleaner (in 10.4, I would sometimes have a sort of messed up checkerboard pattern around the tear; it's more linear now) which makes it less troublesome.