There are 3 Windows 10 systems in the house. I chose the least important one (a Toshiba laptop) to be the first sacrifice for the latest Microsoft update. These updates are big deals. This one took nearly 2 hours start to finish, and it had me go through the new installation checklist to decide what data gets shared with Redmond. (I generally minimize that, hoping to keep a smidgen of privacy.)
The good news, apart from the long waiting for things to complete, is that my laptop is back to what it was before. Supposedly, there are benefits in the user interface -- more Cortana, etc., but they can be ignored fir the time being.
The truly worrying part of Windows evolution is that MS is asserting ownership of my data and my computing life in more and more ways. In the name of "convergence", my PC is morphing into a cell phone, and I find myself slipping into the MS walled garden. Why, it's enough to keep me on Linux for most of my work!
Unfortunately, I do need to keep Windows around for my Amateur Radio operations -- running the Flex 6500. That is my "big" computer. It will be the last one to be updated, given that the Flex software may need special TLC when there's a major Windows update.