Looks neat.

One thing I wonder about tech' like this, is that it is encrypted from you to the service, but there is no assurance of privacy.

Someone who runs a service like this can easy drop in on your calls and ease-drop. Which is a legitimate concern if someone wanted to use this either in a corporate environment or for very private calling (e.g. husband and wife, doctor and patient, etc).

No current video tech' really offers much in the way of assured privacy. Skype used to but it has been largely rolled back since Microsoft took over.