Is it safe to upgrade FreeNas 11.3-U5 to TrueNAS 12?

I’m aware @Tom has done a few videos on TrueNAS 12 – however just wondering if anyone has gone through an actual update from 11.3-U5 to 12? Big upgrades on NAS equipment always make me nervous. Invariably a jail always seems to break or something.

The three systems I upgraded did not have any issues I will have another one done this weekend.

@kevdog - I run two at home myself a primary and a backup. I recently upgraded my primary to 12-RELEASE while my backup system was running 12-RC for a while with no issues. I did have a brief issue after upgrading my primary system with a Plex jail and an Ubuntu VM I run but those were easily resolved shortly after.