I paid for and upgraded to 8. Used it for a week, and still thought it was the worst OS I've ever used. Requested a refund, got it, and went back to Windows 7. I hate Windows 8, and I can't see 8.1 being any better.
I'm investigating the tools I will need to have available on Linux distros for my future beyond Windows 7, because as far as I'm concerned, Microsoft dropped the ball and stopped giving a **** about a large chunk of their user base.