I am curious about this. The introductory price sure makes this tempting. I am extremely happy with win7 and scared to death about the touch centric stuff in win8, but I am very interested in this skydrive integration. Just read a review that this was even more elegantly implemented than Apple's iCloud, which is pretty neat. And Skydrive works like a charm on my iThingys as well.
I'm thinking I will buy the two lisences I need, try it out on one machine to begin with and see how it is to use before I make up my mind. In the future it will probably be great to have the upgrade path anyway...