Anyone have a recommendation as to what to use for these NEW settings in Gizmo5?

https://my.gizmo5.com/gizmo5/app?class=MySip;proc=start

Google Voice - Experimental Service
Google Voice Calling is OFF
Google Voice username:
Google Voice password:

Use for U.S. calls only
Use for all calls
OFF

EDIT: this is answered in post #25 in this thread:
http://talk.maemo.org/showpost.php?p...4&postcount=25

However, I am still not sure if I should use it...
See www.gizmovoice.com