Hi,
See the following for the "official" Comcast Cable Card thread for more experiences that you will probably care to hear about.
http://www.tivocommunity.com/tivo-vb/showthread.php?t=316310
Also, IIRC, I think you have 30 day return policy on the TiVo. So if you pay and then you can't get Comcast to work for whatever reason, you can return the TiVo for a refund.
See the following for the "official" Comcast Cable Card thread for more experiences that you will probably care to hear about.
http://www.tivocommunity.com/tivo-vb/showthread.php?t=316310
Also, IIRC, I think you have 30 day return policy on the TiVo. So if you pay and then you can't get Comcast to work for whatever reason, you can return the TiVo for a refund.