Both my machines failed at the update. Eventually I found a fix online - I had to unplug the ethernet cable just after the updater verified the download. Then it worked, otherwise it failed with the incredibly useful 'Something went wrong' and a hex code. Go figure. The other on virtual box refused to update due to lack of space even though there was enough. I had to burn a dvd and run the update from there then it worked. On my asus skylake system it decided to disable the usb3 driver as incompatible although I have no idea if it is or not.
One good thing - because I had cortana disabled the update appears to have switched it off ! Long may that continue... They still refuse to make the OS GUI look reasonable to the eye. The file manager is very poor and still is a mass of bright white with no options to change it.
I only use windows 10 for gaming, and it does appear a bit smoother after the update. Everything else is on linux mint.