The majority of posts here on AB, from people who've made the upgrade, seem to indicate that Windows 10 is user-friendly and trouble-free. However there have also been some posts from people who've found that something has stopped working on their computer once they've switched to Windows 10.
My own policy (and that of most others I know) is to wait a bit longer, in order that any problems can be ironed out, before making the change (if at all). I've yet to hear of anything that Windows 10 can do that I can't already do perfectly well in Windows 7, so I see no reason to hurry.