Just don't. Save yourself a headache and go with any other similar service.
They recently changed shipping "partners" (eye roll) and I never received a box again. I would report the missing box, they would send a replacement weeks later via another shipping service which means they knew there was a problem with the original shipping service and yet it was never looked into.
I think it's insane that more action wasn't taken. Wouldn't you want to solve this issue and make sure your customers were getting your product!? The customer service emails in response to my missing reports would imply that I must have changed my address and there was nothing they could do--made it seem like they were doing me a favor by reshipping it. Come on.