I used it and found it excellent, fully featured (chat/voice/video), use phone or email as identifier, and supported on all devices (iOS, Android, Mac, Win, Lin

I used it and found it excellent, fully featured (chat/voice/video), use phone or email as identifier, and supported on all devices (iOS, Android, Mac, Win, Linux). I don't understand why it didn't take off - seems like a modern version of Betamax/VHS to me.