This could be a good miner the company could end up being a good company.
The coin is too small the total hash rate is too low.
a 2.1th miner using 1300or 1400 watts for a 1420 th network = disaster.
to give a proper scale
the hash for btc is
26,070,479,913 gh so if someone sold a btc miner using 1300 watts it would mine at 37,243,542gh
or 0.0000349 watts a gh
so this miner will kill the network.
The only robust network besides btc/sha 256 is ltc/scyprt
I was just checking the Top miners on Siamining.com and guess what
Have a look at this
https://siamining.com/addresses/25865daf640696361b432bd517b812270d8459af48f13876108354ee7e028e0e15c13ab5030cThis dude is mining at 1,941 TH/s

and his single worker hashrate is (Average) 4000GH/s
and I just rechecked Halong website and the Black 2B hashrate is 3.83TH/s
and according to his payouts he started mining on 15th Feb 2018
I dont know what to think now

It looks like halongmining testing the miners before they ship. Either that or they are trying to make more profits since they obviously have the miners ready to ship so people will be getting used miners...