We went with Verizon the end of last year. The first couple of months were rocky, as we didn't want the data services, texting and so on. It took three months to get everything we didn't want shut off.
It was totally painless for me. The wife is distantly related to a bulldog, and by the time she finished with them, they probably would have done anything to get her to leave them alone.
On the plus side, Verizon has the best coverage of any carrier I've ever used.