Currently upgrading to @fedora 40 ahead of GA with updates-testing and RPM Fusion enabled... I'll set the flag myself by saying I expect everything to go fine! So much so I'm not even near my system for the next hour; I'm looking forward to going back upstairs and being greeted by a dormant login screen. And yes, an #NVIDIA device is involved...
I did this going from F38 to F39 as well... But I still take a BTRFS snapshot ahead of time *just to be safe*.