How many of you all have made the switch on your main? I'm happy with Win8, personally. The "metro tiles" was a big change from the old start menu, but now that I'm used to the tile layout (with OblyTile), moving back to a start menu would be tough to get used to. I have Win10 on a laptop and using it was...well, different. Not sure I'll be switching any time soon unless I have to.
I made the switch on my main rig, with Debian running on my laptop. I'm pretty content with it, and haven't run into compatibility issues with any games.