Originally Posted by Dartgod
So this is good enough, right?
As long as you don't have a ton of other stuff eating up your bandwidth while you're making calls (torrents, etc.), you'll be in good shape.
As for the original question, my parents have had Vonage for about 5 years. There's a very slight delay (which will be the case with most VOIP providers), but aside from that, it's been great. They even reversed it into their existing phone wiring, so all the phones in the house connect to it.
Only caveat with any of these is that they won't work if the power's out. Not a huge deal, but be aware of it.