Hi, guys, could you please advise? My Chinese source offered me a shipping option - through a logistic company that is an EMS agent (China post). Has anyone ever shipped products to Amazon via EMS? Are they door-to-door service? Do they handle customs? I am really worried that if I ship with them, the goods can get hold up in custom or reject upon arriving at Amazon warehouse (if some expenses are not pre-paid). That's first shipping so I'd appreciate any advice. Thanks.