I just tried if for a bit on my SP2 in Hyper-V. First impression is that the interface looks chaotic. This will take some getting used to. Example: switching to tablet mode, any window on the desktop is forced to be maximized (or snapped). The window 'restore' icon is still there near the top right of an explorer window, but it doesn't do anything, which is bad UI design. Only minimize, maximize, and close work. Just when I got used to the Desktop being an app, they pull this stunt. Other things I miss: having the windows 'key' on the charms bar, being able to hide the right-swipe menu with a second right swipe, being able to flip through apps with left swipe. Even when in tablet mode, doing a left edge swipe brings up the task switcher. In short, many things that made Win8.1 exciting to me in tablet mode have been removed. But maybe I just need to get used to it?