I can attest to the quality of the 2th miner and have it running and hashing. The PSUs used are some unknown brand though (as with all A1 miners nowadays)
This is my graph on MRR and it actually overperforms slightly.
![](https://ip.bitcointalk.org/?u=https%3A%2F%2Fi.imgur.com%2FDGQFLlE.png&t=665&c=2U0oqi6LVGm6ag)
Drawbacks is that it's frickin loud and can't work on P2Pool (gets only 1.3-1.5th on P2Pool)
http://youtu.be/tSFEzduops0So Bit-Winkor isn't a scam company. They are reputable in all my purchases so far and give good support via Amanda. Only thing is that being a smaller vendor, their pricing isn't as good though they really try their best.
One thing I don't like about their miners is that they cut off the fan wires so that it runs at full speed 24/7. Great for farms and cooling but not so good for home use since it's frickin loud all the time.
I also found that in my purchase of LKETC miners and Bit-Winkor miners, that my Bit-Winkor A1 is performing slightly better than the lketc one but it may just be a hardware sampling. The Bit-Winkor A1 is smaller but a lot louder.
As with all A1s, their ssh is locked.