[–] HomerSimpson 0 points 4 points 4 points (+4|-0) ago
I did. You basically lose all software you installed to your computer. Mostly only noticed this with games. Regular files seem to just stay.
[–] phly95 3 points -2 points 1 point (+1|-3) ago (edited ago)
I went to Windows 7 using my downgrade rights, but Bluetooth had this terrible glitch that it would make this buzzing noise like when you plug headphones into a public computer. My battery life was also worse. I decided to go back to Windows 10 after that. The Bluetooth support on Windows 7 is really subpar, but Windows 8 would work fine for those issues.
[–] alloygeek 0 points 2 points 2 points (+2|-0) ago
I've had to do it for client's machines- so far my record is 15-2. It is ugly if it goes bad. I had two go well, but they didn't have any programs installed to speak of (just Firefox/office).
I'd do a full backup, try the uninstall and be prepared to revert via your backup, do a clean install and copy the files manually back.
Good luck.