As much as everybody likes to gripe about Comcast's service I have never had a problem with it and recently had an extraordinary "cable guy" at my home.
Three weeks ago lightning struck a Comcast node in my neighborhood and sent a surge down the cable into my house. Took out the modem, the router, the switch, the dvd player, the tv, the printer, and the push button gate lock. Just under my $2500 deductible to replace everything.
When I tried to put a surge protector on the cable the signal died so I called Comcast to get someone out to check.
Rafael F. , the tech, arrived three minutes early of the appointed time and spent two hours testing and going over my system. He replaced the cable from the pole to the house and discovered that my system was not grounded which he fixed. He could not have been more expert and helpful.
If he is typical of their service techs, Comcast is doing a good job.