I've now read both, and they're quite well done, but I particularly wanted to single out the magnum opus from Paul Thurortt's Supersite for Windows. If you have any interest in buying the Surface Pro -- or just knowing about it, check out his review. It's one of the best I've read -- not of this product, but any. The article is thoughtful, detailed, very opinionated, equally fair, and well-written -- high-tech to satisfy geeks, but understandable enough for most sentient humans to generally follow. (And from my quick skimming of other articles on the webiste, that seems to be the standard.) He fills the review with praise and sharp criticisms, always explaining his reasoning and personal preferences in depth -- something I find exceedingly important because it's not left to the reader to guess what's behind the opinion.
The short version is that he finds the Surface Pro requires compromises, and has some notable flaws, but vastly overall thinks is a wonderful device. But if you're interested in such things, check out the review to find out much more. And -- as someone known to write...er, long pieces on occasion -- bring a sandwich first. And carve out a block of time.