i have made many purchases From GEN Miner Coin Store over the past 6 months and not only one time i have been disappointed. Recently i bought S19 Pro , we made whole farm of machine. when i started Into mining me and my partner asked many questions and they help us each doubt. they are specifically very professional and all shipments i received on time (Z15 delayed but that's was from Manufacturer issue). they made us feel valuable as a customer. One thing i must mention that they are super responsive they answered our email or text at night time also. very happy with the experience and would definitely recommend them. i will continue to purchase with them.