So glad to hear this can also be done with Comcast. The better half pays the bills and I wasn't paying attention. I had no idea they were raping me for $8/mo for a cable modem. Turns out I have an Arris TM822 -- which doesn't look too bad, and is DOCSIS 3 capable. Another comment in here mentioned that the easiest thing to do is call and tell them you no longer want to rent the equipment, and then when you don't return it, they'll charge you $53 to own it. Sounds like a plan.