Actually I am still running an old slow laptop for a few legacy programs at home. It came with Vista, never had a problem with Vista, still running Vista. Probably the most stable Win machine I ever owned. I realize this experience is way out in the tail, but there you have it.
Oh and I agree with Larry. Boot camp for me is not a real option on the MBA. I use it so much and I hate rebooting it since the sleep mode works so well. Parallels caused lots of beach balls and freezes on the MBA, so it was just too annoying.