I am also still using Catalina (latest version, V10.15.7) and yes, it works real well. It's stable, mature, and solid.
Again, though, it's not exactly fair to compare it to Big Sur. The initial non-beta version did recently arrive, but already there is beta available for the next release, V11.1.0, which should be here soon. Based on previous versions of the Mac OS, that version will still contain some bugs/have some issues, and it won't be until V11.3.0 that things finally start to take shape and be OK.
Again, though, it's not exactly fair to compare it to Big Sur. The initial non-beta version did recently arrive, but already there is beta available for the next release, V11.1.0, which should be here soon. Based on previous versions of the Mac OS, that version will still contain some bugs/have some issues, and it won't be until V11.3.0 that things finally start to take shape and be OK.