Short HORROR story: Our mistake was switching from Verizon to Comcast.
Comcast HD cable service brakes when changing channels and the sound gets distorted for no reason (forcing us to turn the top box off and on).
Attempted calling customer service, and 2 out of 3 reps were rude, unclear, or didn't even try to look into options.
Imagine the cancellation process... we had to pay over $200 to get out of contract. DO NOT RECOMMEND COMCAST!