Dunno if this is where to post it....but I have two M CableCARDs working in my old Series 3 HD Tivo on Comcast Waukegan (far north of Chicago.) This when I was very, very wary of surviving another battle with clueless employees at Comcast. The installer was given only one card and says that's all they ever get. When he saw I'd need two he had to drive to get the second from another tech. So after the cable was made live, and my house was prewired in the first place... I had two sessions of get the card serial number, wait 30 minutes for the one guy who knows how they work at Comcast to call, with the run for the second card in between. Each time he had to "hit it again" for me to see premium channels. By following the info here an the TiVo FAQ I ended up with three long trips through guided install (which makes no sense for the second card). I was panicked at first that the Series 3 didn't work with the M card. Reading here and at Tivo I found that's not true. My scheduled 8-10 install window ran until 2:00PM. The tech was good. He rang my doorbell at like 8:20 as I was hanging up the phone with his boss telling me he was a mile away. I could see why he hates CableCARDs, but it would have gone a lot better if they had listened to me and given him TWO CableCARDs. I can imagine what would happen if he had a busy upscale customer looking over his shoulder screaming he didn't know what he was doing. (He did.) I transfered all of Season Passes from my HD DTivo. The bad news: This morning the Series 3 was dead and locked up. I had to power cycle it. I'll accept if it had a brain hemorrhages at the end of a busy day, but I hope it's more reliable than that. I like finally really getting channels in HD. + Oh. One issue. The TiVo doesn't have programming for WTTW-DT. It shows "To be announced." So my Season Pass for Newshour, and I assume other PBS shows, doesn't work. What does it take for the guide data to get fixed? Because mine is already telling me it'll be out of space by the weekend, with the info in the other FAQ, I just ordered a 1TB external hard drive setup with a Hitachi drive. I'll be cancelling DirecTV in a day or two.