Check out Jitsi's participation in the VoIP Users Conference (http://vuc.me)!
Learn more about Jitsi Videobridge, Jitsi's codecs and encryption support.
Keep in mind that this is a hangout screenshare and audio is also bridged
so in reality quality is significantly better with Jitsi!
See the recording here: http://youtu.be/Jh7kGk9knc4
Regards from the Jitsi Team!