I have had Vonage for a few years now. If you have really good Internet connection, it's a damn near perfect service for phone and even fax.
People whom travel, or just move around a lot, it's damn near one of the best tools to own, better than any phone service. Your phone number will stay the same from the US to Canada, and it sounds like some Islands too.
However, if your Internet sucks, has heavy use, or is slow, then Vonage kind of blows.
In Vegas it was great, the Net was also amazing.
In South AZ, it was kind of half ass and so was the net.
In Denver, I couldn't even use Vonage, the net was a major pile of shit.
And, back to Az, The net is good enough now that I can fax through Vonage, takes a couple tries, but they go through.
At the same time, I have heard (in the past at least) that Vonage doesn't always like to cancel your account and will just auto rebill you.. So, maybe some other VOIP services on this post should be deeper looked into
