Word autosave isn't good enough. Here's what happens regularly: I leave Word open without manually saving for days in the background without realizing. Eventually the Surface decides to reboot itself for an update or runs out of power. The next time I open a Word document from an email attachment during a conference call some stupid side bar pops up with a number of revisions of documents that I instincively ignore. Cancel, go away! I'm busy! Oh, now I've lost that work.
I've retrained myself always to save the 'recovered' copies now, and then manually check whether it's newer or older than the last 'saved' copy. I shouldn't have to do that.
I really, really wanted to like the Surface. Just check my previous posts and tweets about it. I still use it, but I am also disappointed.