We have Vonage at home and it's quite reliable. Occasionally you'll end up with bad data uploads (i.e. the person who you're calling can't hear you, but you can hear them fine) but it's become almost a nonexistant problem as we've had it longer. I believe we've had it for nine months now, perhaps longer. The manual said that we can only have one phone connected to the VOIP box (a Linksys router that came free with our system) but my dad hooked it up to our main line and can use any extension with no problem. The free long distance was the clincher for us, as both my sister and I now have friends in college who have cell phones with their hometown area codes.
