My commentary sits here; in short, pay attention to history.

I personally don't use any VoIP yet. Knowing the field, and the incoming LTE transition, I've been doing my homework on the different companies within VoIP, looking to see who has as solid enough base with which to use and be as seamless to my mobile(s) as possible. Gizmo5 has been in there; but sits on the side with the Google acquisition as I'd like to see what changes there.