Haven't touched.
Back in the day I bought Vista x64 when SP1 came out. I'm still trying to find a place where I can buy XP SP3 !
I just find M!crosh!t fill their OS with soooo many useless things (wizards, functions) that the money I spend on a new hardware is pointless as it's sucked dry by windows.
And don't get me started on the instability issues.....
... one can only dream of a Windows that is fast and stable :S