Sorry, but I disagree that it will sell. People seem to forget that Windows tablets have been on the market for atleast 7 years now.
I do think it's a cool looking device and would consider purchasing one but i'm not sold just yet. Also you're correct you cannot compare apples to oranges. A WebOS or Android tablet work be a good comparison.
You may be right, MS has a way of screwing up a good idea But, a lot is different now. The 1st gen tablets were $2000-$4000. Most of the new ones I've read about are shooting for the $500-$1000 price point.
Crashes haven't been an issue on a Windows PC since Windows 98 - at least no more than I had on the mac I used to work on back when I did video editing.