This is my experience with Comcast in trying to get a cablecard working in my new Tivo Roamio: Just for general info, I have two cable boxes and a Tivo HD all working fine. 1. Went to the local CCast service place and picked up an M Card. 2. Called the activation # to get said card authorized. 3. It started working but I got no HBO channels that I get on all my other devices. 4. Called the support # back to tell them of this. Note 1: Every time you speak to an individual you have to give them a bunch of info... phone #, name, address, SS last 4 digits and this is after wading through all the apparently useless auto attendant business. When that person transfers you to someone else you have to give it all again, usually multiple times and frequently I was routed to India and often couldn't understand what they were saying due to poor english language skills. And I suspect when one of them is presented with a problem they don't know how to solve, they just put you on hold a bit and hang up on you. 5. Waited on hold various times over a 30 minute period and was hung up on. 6. Called again...gave the auto-attendant all the stuff it wanted and hung up on again. 7. Called again...talked to another person who transfered me to the 'activation' department (see Note 1) and was told they couldn't help me because the card was already activated. Transfered to 'tech' help. Following another 30 minutes mostly on hold I was told it didn't work because the card had been 'coded' as a cable box rather than a cable card and I would have to return it to the service center for another one. 8. Took that card back to the service place and got a different one. 9. Call back the activation #. It asked for the last 4 digits of the serial number from the card, saying it had to begin with M or G or some third letter. Mine began with a T which was not acceptable so it just kept asking the same thing over and over until I pounded the 0 key to get to a person. 10. (see Note 1) spent about 30 minutes with this person trying to activate the card but it wouldn't work. Transfered to the 'activation' department again (Note 1). 30 more minutes there while it was determined that the card was showing an 'error' when they tried to send it a signal. One more person tried to pair it manually which also didn't work, so they scheduled a service call to get it solved. 11. I decided on my own to take that second card back since it isn't too far away and I figured it would save CCast a service call and get me working sooner. 12. This time they gave me a card that looked beat all to heck but she said they just got it from the 'warehouse' so it should be good. 13. That card was not even recognized by the Tivo, showing it as not installed. I gather that the service place is just handing out broken or dead cards that have obviously not been tested after being pulled from some other service. Summary: After 3 trips to the service place (the third by choice) and a large portion of one day which I estimate around 4-5 hours on the phone with 'support', I still have no working device and will be waiting several days for a Comcast person to come to my house to hopefully solve this. I am really looking forward to the day when I can dump Comcast and move my Internet and Cable service to a local fiber provider. I post this partially just to vent but also to ask... what are the odds that it is my new Tivo that is broken rather than a cable card issue?