I've bought 2 of their GekkoScience 2pac BM1384 USB sticks. Both were shipped and delivered FAST. Love that. The first stick works like a charm hashing at an average of 15-20 GH/s. The second had trouble out of the box and after 2 days went zombie. So my experience with this seller is 100% fast shipping and 50% working hashers. Just be aware that they have no refund / no return policy.