Had it for over a month.
So far it's been a good upgrade, definitely smoother, and starts up way faster than my phone. In no way compared to Vista or 8 upgrades.
Makes Windows 10 feel very outdated. In fact... There is BETTER seamless compatibility of programs vs 'tile apps'. The start button in the middle can get some time getting used to.
The only issue, albeit a noticeable one, has been the lack of drag/drop to Taskbar to pin or to open a file in an open program. Although there are hacks out there an a presumed expectation that Microsoft will reinstate it.