I did because things like Painkiller and NOLF 2 would run PERFECTLY (even on my M6)... or somewhat. NOLF 2 would play the cinematics beautifully, but when the gameplay launched, it would crash. One time I actually made it into the gameplay, and there were some weird artifacts and everything. Painkiller runs the actual gameplay for like.. 10 seconds, and I can tell its a very good framerate from what I saw, but then it crashes also.
The crash is just a sudden blue screen with fast moving code, then a quick restart.
I tried the omega drivers, and framerates were the same as the other drivers, but my test was UT2K3, and it didnt render the sky. So I was like f** this, then deleted them. I cant get that Omega icon off (havent really tried that hard...)