I've had Vonage for over a year a like it. But somethings to keep in mind:
- If you have DSL from Verizon you might have to keep your phone line anyway. Most telco's require that you have POTS (Plain Old Telephone Service) from them in order to get DSL service. You can always downgrade the POTS service to just the basic service but figure that into the costs. Or see what internet service is available from your local cable company
- You might have a problem if you have to keep your POTS line since you won't be able to port your number over to Vonage, Verizon will think you want a disconnect.
- If your DSL connection is on the slow side, like a 768Kbps/128KBps you might notice call quality issues if you're using your computer for surf the net while you're on the phone. Faster internet connections are better.
- Your 911 service MIGHT not work the same as your POTS line. Vonage is working on making it work the same but your 911 calls might go to a regional dispatcher that won't see the calling location on your screen and will have to transfer you to the correct local fire/police department.
- Your Vonage phone service will be only as reliable as your internet connection.
- If you loose power in your house you loose your Vonage service unless you hook everything up to a UPS. Vonage does have a feature that will forward all calls to another number, like a cell phone, if it senses that your connection is down.
So IMHO if you are a bit technical and understand the limitations of the service you'll be OK. But if you're expecting the same relability as your current POTS service you might not be happy.