Cablevision/NortherNJ & S3 with cable cards

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Just had a few quick questions...couldn't get answers really after a few searches so i figured I'd ask. Just spoke with cablevision about the cable cards with the S3 tivo and he said that I would lose the "Guide" feature or channel? How does the Guide function work with Tivo? I have DTV/HR10-250 currently but am thinking of switching...I hit guide and I get a nice pretty guide to peruse? do I lose this idea with cablecards? or is he saying I lose their channel with the scrolling "guide" but I still have the traditional tivo guide?

Also, are there any other draw backs to the cable cards and S3 versus just the sa 8300? I know I can't get PPV yet with cablecards but don't know of any other...?

thanks for the help!