Innosilicon sent me a defective D9. Several scratch on the box, the stickers of warranty were torn and a hashboard did not work. I contacted the technical support. We had agreed to send the defective hashboard and the replacement one at the same time in order to minimize the shipping time lost. It has now been 3 days since my hashboard is delivered to their factory. I have no news of the replacement hashboard. My D9 only works at 1.4Th / S since receipt, 9 days ago. I am very disappointed with this product. I think Innosilicon's after-sales service policy does not respect the customer.