Keet isn't open source, is it? I'll wait for confirmation on that, but it does sound cool. Definitely watching it.
simplex (nprofile…9nz4) works well for me and I can self-host on Start9 (nprofile…w0xz) if I need to.
I dish out incognito profiles to pretty much everyone, then change their display name to keep track.
I have successfully backed up and restored to a new phone, also. That went so smoothly that it scared me.
Calls sound good with a little manageable latency.
iOS users have had some weird issues with notifications and uploading files, but nothing permanent or serious.
I had an issue once with groups and messaged the team. They replied right back with some troubleshooting questions and guidance.