I was, by random choice, I believe, and luck) on the Window Vista and through Winsow 7 Beta testing. I (according to my family- lol!) spent too much time at the keyboard. I was apprehensive when the gossip started concerning Window 8. I was finally tempted and had a look at a recent Windows 8 build.
It is so similar to Windows 7, that the one enormous + is that there will not be the huge relearning curve which was needed between XP and Vista/Windows 7. I am running it as a dual boot but, early days, cannot detect any mind blowing differences so far. Always the pessimist, I am beginning to think that this is now a successor to Windows 7, but an alternative OS, designed primarily for tablets, but with stationary functionality.