I have to say that as a tablet it completely and utterly sucks. Windows simply does not translate to a tablet environment and, other than emergency use, I never use it without the keyboard.
However, with the keyboard and as a lightweight touchscreen laptop for travel, is is excellent. I use Mac for my desktop environment, but Apple have decided for what seems to be purely religious reasons not to put touch-screens into their laptop line, which for me is a dealbreaker. Using the mouse for 99% of the UI, but the finger on the screen to scroll and pinch-zoom when appropriate works really well for me, and when I'm doing presentations from my Surface Pro onto a projector being able to draw onto the screen with the pen is a major advantage.
I know for many of you a touchscreen in a laptop seems stupid, and you're perfectly entitled to that opinion. For me, it works, and it works better than the alternative (which is why my MacBook Pro is now hardly ever used.)