Biggest thing I am noticing so far is "few extra clicks" for a couple of things and that hot corners suck on a windows VM screen that is not full sized. (think esxi screen with vmware tools where the mouse can fall off the screen) It is mildly annoying that there is what seems to be a 400-500ms delay to get "start" to appear so I can right click to get to I want. I am trying to see the advantage to metro also but it is not coming to me yet. The rest of the OS so far is "ok" since I am still figuring out where they moved things.