My boss has had one here in Toronto for a while, seems very happy. Still comes off as a consumer rather than enterprise product at the moment. Like the smaller versions a cover would be a good idea to deal with finger marks etc. If my mother-in-law was looking for a laptop now rather than two years ago - do mails, surf, look at digital photos - I'd have bought that rather than the Vista Dell she has now.
Edit: I hear good things about
Flipboard
I suspect the HP Slate, if properly done hardware wise, could do some damage in the enterprise space especially if you don't need to separately activate/manage them with iTunes but could plug them right into an Active Directory domain.