Sent me a used antminer S1. Manufacturer date was 1/14. Order date was 3/14. Fan and heat fins were dirty and covered with dust. The antminer had been used from the time of production to the sale date. The heat fins were also physically damaged. Both blades were not soldered properly and were separating from the base. I have included pics so you can see for yourself. I contacted Juan from 112bit and he was not helpful at all. He told me i am not the manufacturer contact bitmain. He no longer responds to my emails. If you have any problems he will brush you off and say im just a distributor i cant help you contact the manufacturer. Do not buy from 112bit or bitmain. 112bit is just a middle man and can't do anything but take your money. Bitmain is a chinese manufacturer. They have low standards for quality. They will not accept any responsibility for anything. All of the financial burden is on the buyer. They do not care about their customers. All they care about is mass production and sales. This has been an ongoing issue. I have returned the antimner and requested a refund due to the amount of mining time lost waiting for a replacement. I was told i pay return shipping and they will give me a refund when delivered. After the antminer arrived in china i was told they will not give me a full refund. I am responsible for the original shipping cost, return shipping cost, and import tax both ways. I have not been told how much of a refund i will receive but it will be around $200 less than what i paid. And to be perfectly honest, i have a feeling bitmain will come up with some BS excuse such as it was not returned in the original condition and they can not give me a refund or replacement. May god help you if you buy a S2 from them. They have jerked me and given me such a hard time over a S1 i can only imagine the nightmare you will have to go through to get any kind of support for the much more expensive S2.