I don't know what area you live, but I can say we just switched from Comcast to AT&T U-verse and couldn't be happier. Our bill is $75 lower each month PLUS we receive more channels than we did with Comcast. The customer support has been nothing less than friendly and helpful the couple times we called with questions. The Comcast support is dumb as a rock and very rude the couple times I have called with problems. I am happy to have dumped them.
The sales chat support was also friendly, except I was talking with a rep on the West Coast, and he couldn't answer billing questions b/c on the East Coast, the office was closed. This was no big deal. I simply called the following day to confirm the cash back amounts I am going to receive.
Regarding the installation cost they stated in chat, which seems rather strange, I know most services (phone, cellphone, cable) will ask for a deposit from those with no to bad credit which is usually refunded after a certain period of time.