I have purchased 4 Atnminer S21 Hyd so I can get the Antrack V1 with 50% off. Fast shipment of the order, I've received the tracking number about 2 days after payment confirmation. ETA was aproximately 5 days by using express shipping, so all good untill here with Empire Miners. Had a problem with one of the machines , the miner stopped working and I've contacted them to solve this, untill they've responded back to me I have managed to fix it myself so I have to give them only 4 stars for that. Empire Miners is a legit and honest company with very competitive prices but they can improvethe custommer suport a bit. PS: they do offer straight forward informations and advices, no doubt about that! Thank you!