I seem to be the unlucky one. I upgraded my MacBook Air this morning and have had repeated crashes when waking from sleep. The Apple TV app is also hanging constantly and indefinitely now where it worked before. I'd upgrade to Monterey, but I have abysmal connection speeds and the last two times I tried I got a "we can't complete upgrade" error after waiting 3 or 4 hours. I plan to take the McBook to work where it shouldn't take quite so long, and will hopefully be able to finish the process.