I've heard a lot of positivity about upgrading from 8.1 to 10, which seems to go smoothly and seeing as most people hate 8 is seen as a big improvement.
But has anyone else tried upgrading from 7 to 10? I tried it at the weekend, and it was an unmitigated disaster. Almost nothing worked. The taskbar didn't work, the Start would never open, and even right-clicking almost never worked. And the task manager kept crashing. Every fix I found online either didn't work or, usually, I couldn't even attempt because the other things I needed to use wouldn't work.
Anyway I gave up after a few hours of trying and decided to rollback to 7. Even that was an arse because the online instructions on how to do it required you to open the Settings app, which surprise surprise I couldn't open.
In the end I found some online article that gave an alternative that you can use from the login screen, which worked.
So yeah, my own personal experience is that Windows 10 after upgrading from 7 is a total pile of wank.