Privacy fears still prevail, mostly unfounded, and there are still computers which should NEVER be upgraded to Windows 10, but overall I think that it is a winner.
When I first upgraded, I had issues which had to be sorted and I did at one point consider reverting back to Windows 8.1. Three years into it, and it was a very good stable platform which, as long as one avoided the tiles, worked very well.
Windows 10 has sorted out a lot faster, even some of the tiles, and I like it. You would too as long as it is installed on the right machine.
As with all versions of Windows since the beginning, some of your favourite applications and games may have to be left behind, but that is ok. There are others you can use. All you have to do is find them.. 🙂