The only problem I've had with Win10 was getting it installed onto the PCs in the first place, as soon as it was installed things were fine. Both laptop and desktop are a couple of years old, and both needed BIOS updates despite the Win10 compatibility checker saying they were ok.
As an OS it's been trouble-free to date, and is fairly intuitive. Having used most PC operating systems since DOS 3 it's no worse than any other and better than most. Just some niggling things to get used to, like how on earth I can get to Control Panel from the Settings page. And I miss the swipe from the right search bar of 8.1. And I must also admit having quite liked the Metro screen. Automatically adjusting split screen mode though, that's a wonderful little improvement introduced in Win10.