I've got Verizon and love the reliability! I use it in the HRBT and Mon. Merrimac tunnels with no dropped calls all the time.
Customer service in the Newport News store sucks, but the Williamsburg store is awesome! I'm not sure about your side of the water though. Also if you call them they are amazingly helpful over the phone. They actually told me I wasn't using all the minutes I was paying for and that I'd be better off lowering my minutes per month. I got the Driod for Christmas and they have been super helpful and patient with my tech-challenged self
Depending on what your minute needs are they just recently lowered their unlimited to $69 a month for one phone line, the kids would be another $10 each and it's like $5 or $6 a month for unlimited texting / pic texts. However the $69 plan doesn't give your added lines unlimited calling to outside of Verizon customers. Does that make sense? Plus they have a chaperon application that allows you to know where your kids phones are cost more of course. I've never used it as it's just not my beliefs to spy on my kids, but it is a cool program. And you can set time limits on their usage and shut their phones off at certain times, which would have been helpful to my sister as her daughter stayed up all night on the phone and wondered why she was failing school.
Good luck!!!!