Finally got an email yesterday, saying I have access to the beta. I made a call with it, and it sounded just as good as Cricket’s LTE voice calling. Couldn’t hear it ringing though.
Better then FreedomPop and magicApp, probably GrooVe IP too. It is better then GrooVe IP, as you don’t have to forward it to anything, just use your Google Voice number, in the Voice app.