I'm using Ubuntu 8.04 and didn't like this driver. When I restart X after installing it I had no 3D support, and a reboot later I got black screen of death.
I read in the unofficial wiki that you can fix it by changing the memory from dedicated to shared, but I'm on a X200M and can't reduce the shared memory because my BIOS don't let that.
8.3 gives me a broken X.