It is best to vote with your wallet. I've no experience leaving VOIPo, but I have left Vonage, Packet8, and BroadvoxDirect. LNP was painful years ago, but I expect this will be a no-brainer.

Are you going to wireless or land line?
Wireless is really gaining ground and may be the defacto one day.
Ironically, by that time it will probably be an IP based service too.

The Wife Acceptance Factor (WAF) is often a key component.