Installed desktop version on Manjaro yesterday after reading post on lobsters; electron-based app running on Tor-like decentralized network, requires only username and password during account creation which is something rarely seen nowadays. Settings are protected from tampering by password each time you wanna make a change - which is weird but since it requires only username and password is a fair requirement, I guess. Multidevices support was present but removed due some bugs but as Loki Foundation behind IM states, it's gonna eventually return.

What is unique, is the way contacts are handled - it's an alphanumeric ID you pass to your contact but seems there's a plan to support standard usernames with a fee. Tho, there are also QR codes on profile page you can share with contacts which should make easier adding people.

There's emoji support obviously but no stickers (if someone cares actually about that), delivered/seen messages status and typing, audio messages and spellcheck.

Seems like yet another pretty good alternative but the fact is Australian-based worries me - Oz guys have some issues with encryption law iirc.

Edit: one thing should be mentioned that in order to login somewhere else you need to provide passphrase (which can be found in settings) otherwise you'll be forced to register another account. You can use username and password for in such case since session ID is still different but if you going to test out Session, remember to save passphrase somewhere.

Also, it looks like there's no UI language settings for whole app - it depends on system setting it runs on (at least in GNOME case).