I've tried four versions of Big Sur (11.0 Beta, 11.0 official release, 11.1 Beta, and 11.1 official release) but a critical bug was still there and never fixed. Almost every day, the computer will reboot itself with critical system error warnings without any sign before many times. This critical error is driving me mad! So I went to the Apple Store to downgrade the system twice and stick to 10.15 Catalina. I'll check the security updates only and wait for the next major update of the OS.