I purchased a radio controlled car from them with a bunch of metal upgrade parts. Some of the upgrade parts didn't actually fit as they had different dimensions to the plastic originals. Chinese quality assurance in action. I asked to return those for a refund. BangGood replied and said they'd take a return, but that I would be responsible for return shipping and even customs charges. Thankfully I live in a country that actually has consumer law, and this law protects buyers against sellers who sell items that are not fit for purpose. So I raised a PayPal dispute and got my money back that way.