I used to have Vonage and wasn't using it at all. I took a look at OOMA and Magic jack. The big "minus" to OOMA seemed their box, if it fails, I'd have to buy a new (or refurbished) box, no type of support for it. Magic jack looked ok and their new box doesn't need the computer, but their whole service felt like a 'bait and switch' with very little information as to what you get and how much you pay. It wanted to send me the box, get me set up and then tell me how much it would cost.
In the end I bought a box that lets me use my wife's google voice service on my landline. Since google voice is still free, the cost was $50 for the box, and about 45 minutes getting it all setup.
When I went to cancel the Vonage service, they talked me into their $5 a month service that is free incoming and $.05 per minute outgoing. I ended up cancelling it after 2-3 months, but as a standby phone service, it would have been a decent deal.
Miner