I had Comcast for years and for the most part they were ok. Quite a few outages though and never an honest answer. I have some friends in their local operations group, so I was able to find out what was going on, besides the obvious overloaded nodes.

Since my VOIP is my landline and since we have storms and hurricanes in the Miami area, when ATT finally offered naked DSL(dry loop), I chose to change. ATT has a far better track record of staying alive during these storms, and with my bunch of UPSs, I keep my necessary boxes alive when the power goes out.

Although I was getting twice the speed at less money with Comcast, I tend to think that the VOIP works better with DSL.

Perhaps Tim's peering with them would have blurred that difference, but I feel more comfortable with the chance of DSL staying up during these outages.