Bitmain should take care of the last two posts.
They normally should answer.
Is not acceptable for costumers to take the money and time (so other money) loss for an RMA shipping. And no, coupons don't help in these cases.
Right, there should be some escrow service for all the manufacturers.
We are helpless otherwise.
Escrow maybe is too much, just more attention in the customer support part, and also in the case of s2 a more decent packaging to prevent these horror stories