I'm an Insight customer and a couple years ago some convuluted deal that Comcast & Insight had been collaborating reached its end date and a lot of markets that were branded Insight converted over to Comcast branded markets.
Since Insight's been nothing but great for me I was very worried when the possibility came up that I might soon be a Comcast customer. I've never experienced Comcast, but I'd read enough stories on the internet to know I didn't want to lose my awesome Insight experience.
How close of a call was it? When all the dust settled every market in my state but two were converted to Comcast. Thankfully, I lived in one of the two cities where Insight decided to maintain a presence.