Just tried it with my team - we do typically have network problems with video calls.
The quality for one2one was great, but then it's the same with Matrix (which is also peer to peer).
For group calls (for which matrix uses Jitsi) was also very high quality - however, there were some issues:
  • when the third person connected, I couldn't see or hear him, but the second person could
  • this was fixed by disconnecting and reconnecting
  • after screen sharing the issue happened again
  • I was unable to end the call this time (button didn't work)
  • one user was unable to resize the video (when maximising, it cut off part of the picture). This was on ubuntu.
Summary - the technology seems to have great promise. It's an alpha release so bugs like the above are likely quite normal. We were using mac and linux clients.