I've tried compiz, which works just fine on my 9250, although I don't use it regularly (never
saw much need for a lot of eye candy). I mainly got the 9250 for FlightGear FlightSim, for
which it works just fine (a difference of about 2-3 frames/second for my old recycled no-3D
graphics card and about 30+ frames/second for the 9250 with all the effects on).
And yess, the reason I got the 9250 was that it was (at the time, about a year ago) the best
card with free/libre drivers.