Mike Krahulik of Penny Arcade wrote a review of the Surface Pro. He was very happy with its capabilities as a drawing and gaming machine, with some caveats. Interesting read and the videos are fun to watch:
I guess the way to figure that out is to ask what of my other gadgets the Surface would replace? So for this trip up to the mountains I would have taken my iPad but I took the Surface instead. Not only was it a perfectly good replacement, but I was able to draw a comic strip and play some League of Legends. That’s stuff I couldn’t have done on my iPad. Honestly making a strip isn’t something I could have done even if I had brought my laptop unless I also hauled my Intuos out there with me and again the Surface fit in my wife’s purse.