I've got Vonage, and I agree with Tcel93, it all depends on the performance of your underlying broadband service provider. I have Comcast too, and so far (knock on wood), the access has been stable. The only downside about VoIP/Vonage is that during a heavy download, you do impact the quality of the phone call. They attempt to use QoS to dedicate bandwidth to the voice call, but it doesn't always work.
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