The Dragonmint miner may be real but what I've seen on YouTube and read on Bitcoin it may also be dead after some of the other companies like GMO come out with a 10nm. chip later this year. Here's one of the articles I'm going by.
GMO to Invest 10 Billion Yen in Its Own 7nm, 5nm and 3.5nm Dedicated Bitcoin Chips
Bitcoin.com - Official Channel
Published on Sep 14, 2017
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More details on the Japanese Internet Giant GMO’s plans to enter the Bitcoin mining market have been released. The company has revealed the hardware and performance specifications for its upcoming 7nm process ASIC mining chips which feature very low power consumption requirements. GMO also divulged its plans to produce and sell PC-ready ASIC mining cards to consumers.
And take a look at this (
https://news.bitcoin.com/gmo-to-inves)