ASUS X59SL I have always had issues suspending, hibernating and user switching if you use the ATI binary drivers. The webcam is upside down but that will be fixed soon in the UVC drivers. I can't use 2.6.31 kernel yet due to the wireless drivers (ath9k) deadlocking the system, but I haven't tried to get the latest source and build them. Battery life blows (2.5 hours, if I am lucky). It does the job, but I wouldn't recommend it.
