Yeah, I was super excited when I saw this on Engadget. My only problem with it is the assumption that your cable provider is worth a damn. Cox really has the most apt name of any company who ever existed. Every time I see a commercial for their digital cable service, touting the quality you'll be getting, I think about the horrible looking channels we had when we were Cox subscribers. I seriously doubt they'd do HD any better.
Still, I'm excited that Tivo's making the effort. I hope it keeps them afloat.
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Matt