Everything! I have been shipping close to a 1000 items from Ebay to Amazon, after i found Fishisfast i have stopped using others. You don't know what you missed until you try them. I have posted a screenshot of my shipping screen for you to see.
They collect different shipment and send as one package
They provide you a special space for your shipments any also the send emails with photos if anything arrives to your mailbox an they have free of charge packages combining service which helps you save on shipping costs. And much more good services
Registry is free, and it's located in a state that doesn't tax, also you can leave your packages there for 6 months before they start charging you.