When I guess I have been lucky - touch wood. Took the plunge and upgrade my mid-2014 Retina MBP on Friday, all seemed well. I think when it rebooted it somehow got stuck on the Apple Logo with the progress bar about halfway and appeared to have stopped. I turned off power and re-powered in up, and my MBP came back OK with the screen and Big Sur's login screen was shown.
However, I spent the next day or so trying to make sure any apps that I have gets updated to support Big Sur - there are still apps that just wouldn't run, some will outright crash and reboot the Mac (i.e. get a black crash screen). And I too had issues with my windows 10 VM under Parallels. So, in a way Big Sur has given me some initial headaches, it is beginning to be useable again, hopefully things just get better as times goes by.
I'll definitely be holding off updating my 2015 Mac Mini though...
However, I spent the next day or so trying to make sure any apps that I have gets updated to support Big Sur - there are still apps that just wouldn't run, some will outright crash and reboot the Mac (i.e. get a black crash screen). And I too had issues with my windows 10 VM under Parallels. So, in a way Big Sur has given me some initial headaches, it is beginning to be useable again, hopefully things just get better as times goes by.
I'll definitely be holding off updating my 2015 Mac Mini though...