Just an experience from Comcast in MD (Baltimore City) - We got two new Tivo Premieres and I went to the local office to pick up the M-Cards to install them myself. It's so easy to do - not scheduling an installer. Well, sounded great at least. Let me say in summary that the Tivos are up within 48 hours of me taking them out of the box so I'm pleased but I wish I had asked a few more questions first. We have a Premiere XL in the house already with a functioning Mcard that was put in by an installer in early '11 - no problem there. So, at the local office, I ask for the cards, the woman raises her eyebrows and disappears. Comes back with two Motorola Cipher cards in their little plastic packages. She writes down the serial numbers on a piece of paper, and hands them to me. I sign some comcast sheet and leave with nothing but the two cards. I ask if there is anything more (install kit, paper, anything?), nope. Seems easy enough though and I'm pretty psyched. Actually getting through the office here in Baltimore City in less than an hour is a huge victory! That night, I go to set them up and get through everything with no problem. (I had done Guided Set up for each already). Go to activate the card and the trouble starts. First, there are new call center hours for activating a card - they are 8 AM to 1 AM EST. Bummer. Understandable, but still a bummer. So, trying again in the AM. The first card couldn't be activated by the techs on dedicated activation line - they had to pass me up to the level 2 TSRs (in New Jersey, they said) who was able to pair the card and the Tivo. All seemed good but I still couldn't receive the HD channels that were digital "extended" or my premium channels. We agreed that they might come in "later" and I'd call back. Set up the 2nd Tivo and M-Card. That one was able to be activated locally but had the same issue. I could see the HD versions of the basic channels but not anything beyond that. So, now I knew this wasn't a card issue, it was a signal issue. LONG STORY short - after a few more calls, several hours of trying to troubleshoot this, countless times of "sending signal to the card again," I end up going up the customer service chain at the end of the 2nd day where they finally realize that the cards were never authorized/activated on the Comcast side. So normally they would be authorized by Comcast, given to me, then activated when in my Tivo and my cable package would be applied. These were just dumb cards that had no ability to connect to Comcast. I could see the channels b/c they were just a cable pass through, not actually being sent via signal to the M-card. The tech apologized and said they should have realized earlier that the data fields in the cards were blank in areas where it normally had Comcast information - should have tipped them off. (Yes, I said gritting my teeth, it should have tipped you off HOURS ago!) *FORTUNATELY* I had a previously-scheduled Comcast service visit today (1 day after all the Mcard attempts) for phone issues b/c we have Triple Play. I was able to have them bring two new M-cards. I swapped out the cards ("Austin," the tech watched and said he hadn't seen the "new" Tivos so he was glad that I knew what I was doing), called the number and activated them and all were working fine within 5 minutes. Quite an anti-climactic end to the tale but a good outcome! SO glad I spent my Sunday trying to figure out what was going on with the other cards! Anyway, I'm not sure what I could have done to avoid the situation because I would have assumed they'd give me M-cards that would be ready to go. I should have perhaps known because when I asked if there was any installation instructions or even a piece of paper, the CSR at the Comcast Office said, "Honey, I don't know. I hope you know how to use these things because I sure don't!" Guess I'm just passing it on - can provide more details to anyone who's interested. I wish I had my Sunday back but now we're happily zipping along. Had the cards been good to go from the beginning, it would have been an absolutely painless process.