Pros: No suprise charges, free night&weekends, affordable, usually a strong signal
Cons: Honestly, I haven't had any negative experience thus far.
Summary: The thing I like most about alltel is that you get exactly what you sign up for. I am not plagued by random charges like my friends with cingular, nor are my calls dropped frequently like those I know with T-mobile. I almost always have a strong signal even though I live in a rural area, and I almost never have dropped calls. I don't know too much about the customer service, because I have never had to call them, no problems to speak of.