I have recently installed Nvidia's open source drivers on my laptop (Nvidia GeForce 420M) and I have noticed that compiz effects are more smooth ( e.g. I do not get any more lags while soing Win + W ) ...
Everyone knows that in general, Nvidia has the best supported graphics cards under Linux. But I don't want to buy into Nvidia's proprietary drivers if I don't have to. ATI has open source drivers, but ...