I have not seen this discussed here, thought I might share my expirience.
I installed my crossfire 4870 system last week and was rather disapointed by its overall performance and stability. STALKER does not launch all of a sudden, flickering in a large number of games, just OK performance in most new 3D games, etc etc etc.
Well I installed Cat 8.7 beta and have to say I am rather happy now. No more stuttering, FPS in WIC jumped from 43 average to 50 on all settings set to max , everything is just lovely, about as stable as Beta drivers go. Highly recomend installing it (just google Catalyst 8.7 Beta)
Actually yes SpinachEater, lower GPU temps, I am using an aftermarket cooler and my idle was 60 now its 47 load was 80 now its 60 tops after a stress test. very nice!
Bioshock, Crysis, COD4, and WIC all look amazing and run VERY smoothely. I was a huge nVidia man, just never saw the reason to change horses. That is untill these cards came out, and my other choise was a single GTX 280. Screw that!
Couldnt be hapier with the drivers and the cards themselves.