Could you share your numbers, Xian? I'm very curious about them.
Admittedly, I suck at math, so it's quite possible I'm off my a couple weeks with my ROI estimates.
The 120 day figure is based on my current extrapolations, considering that my existing, paid-for operation, already brings in x BTC per pay, I'm going to be getting x + ~1 BTC more per day for the next little while just with these additional ASICs.
I hope you can appreciate me being intentionally vague.