2) Actually sends dimensions + weight properly, and has nice options for specific or global handling fees, and also to pass off discounts to customer (or not to). Neither of which JC FedEx had (and JC FedEx was more expensive)
3) Excellent support and good documentation. I asked a couple questions and they got right back to me and sent me to some documentation on the website I overlooked
5 big stars. Yahtzee!