I think Comcast depends on where you are - our daughter outside of Richmond, VA has them - horrible service. I took them 3 tries to get her cable TV AND internet service working just so-so. After they left it still took a 12 year old neighbor kid to get it fixed right.

My service is Time Warner/Earthlink which so far have been great. My house was originally wired with too light coax cable for HDTV and internet - they came in and rewired the entire house, starting at the telephone pole connection and best of all, at no cost to me. While I don't have their VOIP phone service, am about ready after just paying my ridiculously high Verizon bill