I am a user of brains, currently and I confess that Bitmain is disgusting, currently, in the last S9 they sold from the J Series, they removed a chip, to block the writing of the Nand. Not only did they update the 2019 firmware, but they removed hardware to disable writing on the control board. They sell miners set at high voltages, when they can be more efficient, either by frequency or by voltage. It was the case of miners 12.93 Mhz, set over 9 volts and frequency of 600 Mhz (1450W to 1600 W). I admire the trajectory of kano, but I also congratulate the courage of thierry4wd. I think we shouldn't argue, we are on the same Team!