A couple of weeks ago I switched from my current VOIP provider, SunRocket, to Vonage. The reason to do so was fuelled by:
So far, I have not been disappointed. Although a little more expensive, Vonage sent me through a single unit which has the VOIP capabilities combined with an 802.11g wireless router. It was easy to setup and the quality of calls thus far has been very good. Of course, I'm still waiting for my home number to be transferred - it should be interesting to see how well this is supported by two VOIP providers.