With the new chip of bitfury at 0.06 w/gh and the fact that the CEO said he want to reach HEXAHASH, I dont know if I will buy a S7. 
"BitFury has announced it has completed the tape-out for its 16NM ASIC bitcoin mining chips, which were first revealed to be in production in February."
The way I see this is: They won't start producing the chips before february. Unless the above statement actually implies starting production earlier. Either way they will probably need a couple of months to test the product before selling it to the public (read: Mining companies).
The fact that this statement came right after Bitmain's release of the S7, makes me think they are trying to influence S7 sales by making the decision to buy one harder. (Uncertainty around future difficulty increase).
In the end, the difficulty is the number 1 factor to if you're going to get ROI or not. <- And the excitement around diff is whats keeps me mining, its fun and makes following the community a lot more fun.
If you are looking for this kind of excitement, you should buy one. If not, buy coins instead
Btw, my grammar is horrible!
sounds like a sort smoking stuff thing 
