AT&T Lumia 920:
1. People app crashes when I try to create groups.
2. When I try to add people/groups to my Quiet Hours breakthrough circle the app crashes back to Cortana.
3. For some reason I can't sign into my OneLocker database.
4. I couldn't sign into Feedly in NextGen Reader. After a restart the app is grayed out and has an (!) explanation point. Uninstalling isn't an option on the app list, so I can't reinstall it.
5. Like NextGen Reader, there are a number of apps that can't be uninstalled.
6. When the WiFi button says "Available" and I tap it, it disables WiFi instead of taking me to a list of available access points. I don't know if this is a change from 8.1 or a bug.
7. When I change the background for the start screen to tiles, it shows a copy of the background image on every individual tile instead of a windowed background like 8.1. I don't know if this is a change from 8.1 or a bug.
8. The OneDrive app crashes every time after I sign in.
Quiet Hours not working is a deal breaker for me, so i'm rolling back to 8.1. However, after playing around with 10 for 24 hours a lot of my fears have been alleviated. The only issue I had was hamburger menus. I didn't think it would bother me, but it turns out I use my phone one handed a lot more than I realized.