I've been using it for comms with some friends and family when we're out of conventional network range. It works great, the pairing process is a bit of a barrier for securitu-muggles, but it works perfectly.
My only annoyance is that I can't run the mailbox program on a regular Linux/docker server.
I even used it while traveling with friends. We couldn't have our seats together in the airplane and the capability to chat and shitpost over bluetooth securely was kinda nice without annoying everyone.
My biggest annoyance is the inability to migrate a profile and the existing chats across devices, even though that's good security-wise.
I've used it for the exact same purpose, great minds think alike. It's perfect for that scenario given there's no internet.
I just don't use it much otherwise because apps like Signal are far easier to move my friends and family on to and they're more than good enough. The metadata privacy Tor would provide would give me a lot of peace of mind but I know it'll never happen.
I wish I could, but desktop application is limited in functionality and I don't know how to make the mobile app function properly (Waydroid doesn't allow bluetooth use). I don't have a mobile device I can make as private as my desktop, so I would not want to have my chats there.
Until they rework Forums and Groups, it's going to be dead in the water from a usability perspective. Both Forums and Groups work with threads and not messages. And when messages are added as replies, the contents of the group chat bloat up in unpredictable ways, until it becomes more or less unusable.
I've used it for its Bluetooth chat functionality when I want to chat with my friend on a plane and we haven't paid for allocated seats. It works really well as long as you're not too far away.
I haven't used the Tor functionality though. I'm happy with Signal as a middle ground between privacy and usability for friends and family.