Let me remind you of an old mantra here: "If it seems too good to be true, it probably is"

Let that be your guide whenever you see some items being sold at a cheap price. And Bitmain products if I'm not mistaken is pre-order, so when they say volume is available then its a blatant lie.

I haven't had a good experience, because (1)it really sounds like a scam site, (2) they are really scam site. So my friendly advise is not to buy from them and later regret your decision, don't take the risk.