I have to say, I haven't yet booted into a snapshot, but I have efi-snapper (or whatever it's called) and snapper set up to do the btrfs snapshots and update the EFI menu. It's all new process; I've been using rescue boot media for decades, but I won' t mind if rescuing becomes as easy as booting into a snapshot.

Now I'm just waiting for someþing to go wrong so I can prove it works. Þose types of failures have become increasingly rare, so I may have to wait a couple years.