My coverage is better than most of my friends. The phone works in surprising places (in the mountains, etc). Service is fine. It's really easy to do almost anything you would want to do with your billing, etc online without ever talking to anybody. I've never really had to do any major trouble shooting though.
My only gripe is the 2-year contract and the fact that Joe Blow can walk in off the street and get a better deal on a new phone that I can unless I wait 2 years.