I have a rev B, SSD. So far it is ok as far as the fan goes and memory use is only up slightly. However temperature, even on a flat surface' is around 50 idling and surfing safari I am 60+ and this is noticeably higher than I was in Leopard. Btw surfing means no flash only reading forums like this one. Battery the same or actually lower... So far I am not impressed with the upgrade to Snow Leopard. I was really hoping that would make the MBA really useable with lower temps and longer battery time. Will try SMC reset and see what happens. If that doesn't help I will roll back to Leopard using my Time Machine backup. Btw, If I do an erase and restore (which I understand is needed f I go back to Leopard) can I format my HD to have a Windows partition? Or does the format need to match TimeMachine exactly?