It's mediocre at best.
When I have an outage, you have to call the central call center in Canada, where they do stupid crap like powercycle your modem and release/renewing your IP. then they transfer you to a local tech, where they cant get a tech out fast enough to diagnose the problem. The next day the service is OK or still down and youre without service.
Most of the time the service is trouble free, but when you get problems, you get PROBLEMS. I had about 10 TWC trucks in my neighborhood a couple months ago tearing everything out and replacing tons of equipment cause there was a mystery problem that nobody could solve.