Fair and Reasonable!
I signed up with Virgin in early January of this year on their $25 Talk and Text Plan + $20 for 2GB of data, for a total monthly bill of $45 on the Virgin Mobile SuperTab. This 2GB add on is fantastic, and many other carriers require you to pay anywhere between $50-$65 before you have access to 2 GB of data. I have had no issues at all with billing, and their customer service staff has always been friendly with questions and inquires about products or your plan.
Great rates, fair pricing, and wonderful to do business with.