- On a mac, the client crashes regularly. I've been able to register an account and make a video call, but there are several GUI issues (cut labels, missing text fields, etc.) and the name registration didn't seem to work.
- On android, the client acted really weirdly in the beginning. After a while it seems to have stabilized a bit, and I've been able to make a video call (to a mac). The video quality was fine, but the client did not handle screen orientation changes well (my own video feed ended up distorted).
- On linux I haven't been able to make a call, even though text chat worked. It may have been because I don't have a webcam...
All in all, the experience was far from what you would expect from an 1.0 release nowadays. It had major warts on all platforms I tested.
Also, if anyone is curious, you can login with the same account from several devices at the same time. Calls ring on all devices, but text messages are less reliable (they don't always reach all devices). Also, off line devices do not get the messages they missed when you fire the client later on.
I would love and push hard to replace skype/xmpp with a solution of this kind, but I just cannot in the current state of affairs :(