My girlfriend got one and she wouldn't dream of putting osx or windows on it. She wont even let me throw the jail break switch and get a proper shell. She uses it mostly when she travels because it's light and has 3g, but its never far from the couch. She had a few issues with it and reported them all as bugs, and while there was zero feedback on the bugs most of them were fixed silently soon after. The only major drawback is a lack of MS office. For anything work related she has to go back to her laptop.
I wanted to share a story about it being used as intended.