Depends on electricity cost.Here S1 are not profitable unless underclocked.
S3 barely profitalble Dont have S4 to say...
Bitmain is offering the top models in high prices lately that will never ROI with this BTC price
So the s5 will not be an exception to this I guess
Currently my equimpent is 50% is Spondoolies 40% Bitmain and 10% KNC
thinking of dumping the KNC soon and get more SP
Nothing Spoondoolies makes or sells will make more BTC per dollar spent than a Bitmain S3 or S4. No way Jose. We are setting up a large mining farm and it will all be Bitmain products.