I have been a customer with AT&T since 2010 and I love, ABSOLUTELY LOVE their service. Both customer service and phone service are awesome! Price was not my main concern as I focused my search on the BEST network=speed, reliability and size of network. I highly suggest checking out rootmetrics.com for anyone looking to compare the carriers. You will see that you pay for what you get and for just a little bit more you get speed, reliability and large network!
btw, I just came out of contract and switched to their new plans. I'm saving $15 per line and I have NO CONTRACT!