I have tried that before and just now. it does not show up at all, I have talked to customer support for a few months now and all they keep saying is that it is not available right now and they have no date of when it will return.
Nettalk is what I was going to go with when I decided I didn't want to deal with MJ's craziness anymore. But the day I was going to sign up with Nettalk is when pchonesoft released GVJack and I jumped onboard, especially since I was already signed up with my GV account. I haven't regretted that decision.
However, if GV started charging an amount I wasn't willing to pay, or if pcphonesoft discontinued GVJack my first choice would be Nettalk.