Advertisements I just got a TiVo HD XL, and was on the phone to a very helpful guy named Pete at the TiVo Cablecard hotline, trying to solve some pairing issues with the card and Comcast (probably a bad card). He was surprised, and I was too, when he told me that he'd found that having a single M-card was NOT sufficient to have 2 working tuners on the XL model, that both slots needed to be filled. He said that an M-card in Slot 1 would give me one fully working tuner, but that some channels would not come in on the second tuner. He said his information showed that the XL model needed a second card in the other slot, even if the first card was an M-card. The second card could be M or S, it didn't matter. This guy really seemed to know what he was talking about on everything, so I guess I believe him. When I told him that meant Comcast would be charging me $2/month for the second card, he actually gave me a credit to my monthly TiVo subscription to make up for it for a handful of months. (The monthly is on a Series 2 box...I bought lifetime on the HD) So my question to any TiVo HD XL owners (XL only!): does anyone have just ONE M-card in slot 1, with slot 2 empty, and get the full set of channels on both tuners? Thanks.