Bottom line, is there any compelling reason for me to upgrade from 7?
If you had Windows 8, I'd say to go for it. (Unless you use any software that's not compatible.)
7? I'm not sure yet. Windows 10 is smoother and prettier than Windows 7, but I don't know if it's worth the hassle.
I'll probably upgrade one of my Windows 7 computers today or tomorrow, so I might have more of an answer then.
(FWIW, there was no hassle for me on Windows 8 - all I had to do was give it the 20 minutes it needed, and then click through a few options.) It's pretty easy to get used to - not so confusing like windows 8 was...