I finally got it upgraded and I'm soooo disappointed. The "start button" just takes you to the "modern ui" page that I hate. I don't see any significant difference between 8 and 8.1. It looks like my kindle fire, which is great for a tablet and sucks for a desktop.
I promptly downloaded the trial for Start8 and love it! I should have downloaded that a long time ago. Live and learn.
Anyway, I'll now have the Win8 engine driving my machine and the intuitive interface of Start8. I'm now a happy camper.