I wasn't really going to bother upgrading from 8.1 to 10 (mainly laziness and having only just gotten comfy with 8.1).
But then my mum upgraded to 10, and I had to upgrade too because my mum always comes to me when she has a problem or doesn't know how to do something. It's hard enough guiding her when we both have the same OS, and it would have been impossible if I didn't even know what her OS looked like.
But I'm very happy with 10. I've had no issues and I like that I no longer have a second desktop in the Metro page.