Hey Guys,
...Customer support at Bitmain is swamped, understandably.....
Best Regards,
Pr0p0f0l
They have good customer service. I've bought several S2 without the coupon. They send the price in dollars, the price of the coupon had already been deducted, and I paid the BTC for by the exchange rate of the S2 orders.
For larger purchases, just ask the price, if you really want to buy 100 pieces S3.
Cheaper than the manufacturer can not take them anywhere.I have purchased a total of 16 pieces of S2, replacing one power supply and one power board, which bitmain customer support sent me.
I'm happy with them.
I currently mine with 20Th/s .
1 TH/s bitfury rigs
7 TH/s KNC (6 modules of Nov. Jupiter)
12 TH/s Antminer S2
They newer ROI , I do not see any reason for increase it to 4x , to earn maximum 2 BTC one day.