Went from 7 to 10 a couple months ago, wish I hadn't. The pros don't really have much use to me. The Start menu related cons are beyond annoying. I agree with the messyness comments - I deleted everything MS put there that I could. Search functionality, awful. But worst of all for me is that I like to use keyboard, not mouse, and selecting what I want now from the menu is a cruel game and I hate it. Compared to W7 where, for example, if I wanted to shut down I hit Start -> Right -> Right -> Enter; in W10 it is Start -> Up -> Up -> Enter -> Up -> Up -> Enter. It feels like entering cheat codes in Nintendo
Start up screen is awful too. Why do I have to click or type before the password screen appears???