I almost at breaking even point on ROI on 4 antminer s3! Bitmain u rock!
It's all gravy from September 2014 and onwards! This was the best purchase of mining hardware that I ever done!
The last line contradicts itself by my opinion and helps me to prove my point that after ROI the S3s will be useless.
How will those group buy SP 30's do ROI wise? I have not run the numbers, but with the specs off by a bit wondering if you will profit?