Earlier quoted context omitted.
Beautifully mediocre, but yeah it mostly works. (Never been able to use Signal so I can't compare, but Riot's encryption was completely broken until a few weeks ago, and now there is only the occasional "hold on, gotta fetch keys for 10 seconds" and slow scrolling up, etc. It can't compete with something like Telegram in terms of UX; it is infinitely better for privacy but it doesn't "work beautifully".)
It was a non-stop shitfest of buggy encryption and broken UX last I tried. A group of us tried using it for a bit and gave up because we kept losing messages, couldn't figure out which messages were "secure" in various ways, and had confusing horizon effects where only some people could see some messages. That was a couple months ago. Maybe it has improved massively since then? I guess I'll try it again later this ye…
But, also this experience may not have been possible before may (when they released a big update with e2ee by default).