125 was NOT rosy experience for myself. I restored my 122 image.
Upgrade in place:
explorer crashing desktop every 5-10 minutes.
my wlan had sporadic speed issues.
All modern/metro apps that decided to work, started 1/4 size.
mail decided to no longer work. Fortunately I prefer outlook.
Pen occasionally decided to stop working at random times.
The worst was item 1 tho. The rest I could have possibly lived with, but having desktop crash wasn't a good experience. After about 6 hours, I rolled back which wasn't pretty either this time so I restored my backup.