The quote cannot be verified, but it does appear on a first-person account written on the independent Vonage Forum by a Member who identifies himself as UMP25.
Seems as though UMP25 was having some technical problems with his Comcast service, and called for a tech to come out to his home to fix things.
Originally, UMP25 noticed a drop-off in connection speeds- directly traceable to him signing up with Vonage. This whole issue has been highly controversial on the Vonage Forum, with the thread containing Vonage users' thoughts on this matter now over the 27,000 page views mark.
While the tech diagnosed the issue as a cabling problem, and fixed the underlying difficulty, it seems as though the unnamed tech and UMP25 got into quite an interesting chat.
UMP25 recalls the chat going this way:
I got into a discussion with him about VoIP, Vonage, Comcast's own VoIP, (Comcast DigitalVoice),etc. He was quite frank with me, telling me, "Don't get our VoIP. We're still working out a lot of bugs. It's just not worth it." He didn't know that I specifically had Vonage, so he continues his discussion, "If you're going to get VoIP, get Vonage. They're the best."
At that point I told him I had Vonage and have not been experiencing problems like many others have with Comcast. I told him about this forum and the Comcast v. Vonage thread and we chatted a few minutes about this issue. Here's what he told me: "yeah, we've been having some issues in certain areas, Michigan specifically."
I asked him if Comcast was doing anything intentional or specific to disrupt VoIP, and he said this: "No way. I can tell you straight, Mr. UMP25) , that our own VoIP sucks, but we are definitely not blocking any VoIP. The FCC has warned us about this. We're not about to do something that stupid. The issues we're having are technical ones, but I don't know the details about that."
Yes, I know this is hearsay, but you have to admit, an interesting conversation.