In the 1980s, I asked my SIL and BIL, who were early investors in cable (made a fortune using investors' money to buy a franchise, added subscribers, improved programming and sold the franchise at a profit) for a good cable company stick. They said Comcast was "a good little company". It split multiple times till my cost basis was about $2/share. It's around 30 now. I sold mine ages ago but it was a nice run.
When late DH and I moved here 10 years ago, the previous homeowners had Comcast and told us that if we went with Comcast we'd be guaranteed the same rate they were paying for 2 years. We signed up. They told us they couldn't tell us what the previous homeowners were paying- it was "confidential" - but they did say we'd get a $200 gift card for signing up. We never got it. The husband of the couple repeatedly asked the realtor if we'd signed up with Comcast. I suspected they promised HIM $200 if we signed up and they didn't intend to pay both of us. I never followed up.
For me, the breaking point was when the rate DID go up. It was a small amount, just passing on the increase from one of the content providers, but that was the death knell. When looking at Google Fiber I asked Comcast what they'd charge for Internet only- no programming. The cost was higher than what I was paying WITH programming. It made no sense. I've been very happy wit Google Fiber + Netflix and used Ting on my phone for years but now have Mint. I will never bundle those services together,