I have been impressed with how smoothly the upgrades have gone for most people. Still room for improvement, though Windows 10 did a lot of important work in that regard.

Going forward, they plan on future updates rolling out in a similar way. Microsoft's internal goal was to try and match Apple's yearly cycle, but from what I've heard they had to back that down to about a 2 year cycle.

Doug, did you install a replacement Start menu in 8.1? That's one thing you may want to uninstall now that Windows 10 brought it back natively. At least personally, I try to minimize the number of apps that change the stock OS via unsupported means.