I've had nothing but issues since upgrading. My graphics driver (which I've changed, uninstalled/reinstalled, and fiddled with almost constantly) likes to randomly stop working, sometimes causing the whole damn computer to crash, and neither microsoft nor NVIDIA have a fix for it, I loathe the set up of the OS for a desktop or non-touch screen laptop, I've found the performance is worse than it was with 7, when I first installed, it FUBARed all my fonts (ignored the default font setting in windows and instead decided to use one of my artsy, wacky fonts for everything... nothing on my computer was legible) so I had to uninstall all 5k fonts and strip them down to the basic windows ones, and the other day I thought I'd lost everything on my HDD because I booted up after shutting down the night before, and it told me the boot volume was unreadable (or something to that degree). It took two hours of running win10 from a disc I had to burn with my laptop and using the repair utility to fix it. It should be noted that the last problem is a verified and common issue with 10. A simple google search shows tons of people have had the problem, and Microsoft's only answer is to use a disk or usb drive with win 10 to "repair" the volume. This can take HOURS.
I don't recommend 10 to anyone. At all. Ever. Hell, I build PCs on the side a lot, and I made it a point to buy a bunch of win 7 disks so I would have some built up for future projects. >.>