I had a rather odd problem with Win10 and that is it hurt my eyes. I don't know whether they changed something with ClearType or for some other reason but after two days I reverted back to Win7.

Other than that, I really didn't like the UI. To change colors in menus you have to use a hack because the preselected list of colors is just dreadful, the start menu once again is all over the place and various other mishaps that give the impression that it's not a finished product. They try to build a unified OS for all devices when all I want is a simple desktop OS.