I bought a quad on ebay and had it shipped 2000 miles through uship. I received several bids under $450 but went with a $450 bid because of the shippers excellent feedback, quick time frame and he used an enclosed trailer. Everything went perfectly. 
Payment is set up like this:
1. You deposit funds into a uship account after agreeing to a bid.
2. Once the item is delivered in satisfactory condition, you release funds to the shipper.