Well the upgrade process from 7 to 10 was almost completely painless. Took a while to download and install, but no hangups and once it got going all was fine. Been having a bit of an issue with my WiFi adapter, but I think that's the adapter's fault.
Initial impressions just have me thinking "damn this is quick." I'm coming from 7, but this OS feels so much smoother and quicker. I like the dark aesthetic, although icons are a bit too small. I'm about to test some games right now after installing the AMD driver. If games work okay I'll go ahead with a clean install. So many things feel "right", coming from a 7 user with little 8.1 use, this is good.
GTA runs like butter still. Didn't do a side by side, but I might have gained a few frames too.
Skyrim runs beautifully as well. I had several mods installed, both via Nexus Mod Manager and Steam Workshop. Didn't touch a thing outside of the upgrade and they all worked fine.
Terraria is also fine. Very demanding game. I'm impressed.
Switching between Windows is amazingly quick. The traditional ALT+TAB still works in the usual way but WIN+TAB will bring up all your open windows and lets you switch between as well as making a whole separate desktop.
I guess I don't need to keep rattling off features and stuff since this has been widely available for a while. I'm very impressed with this though.
Creating a bootable flash drive takes a good amount of time. You also have to redownload the data files for it, which is annoying.