I just recently got Vonage and I love it. I have had a couple people tell me that there is a bad reception, but for the most part, I haven't had any issues, and it sounds perfect to both me and the people I am calling. I love the fact that I have voicemail, since I work from home, and my home number and "work" number are the same, so that if I am on the telephone, and someone calls in, they can go directly to voicemail. With the cost of telephone service where I live, I am saving well over $50 a month for the features that I receive with Vonage.
The other downfall is that there are only two telephone lines that can be connected to the device. We have split them, and run a line out to each room that we want a telephone in. (But we live in a small apartment, so if the phone rings and we're not in a room with a phone, it's a short walk to find one.)
We got ours from Circuit City, when they were running a promotion for a rebate on the actual device.
We do have 911 access, in San Diego, CA.
I heard about Vonage from the DIS boards originally, so I am happy to pass the info along!
