@fantastico If you check out older model miners such as the Antminer s1 or even the s7, miners make the largest profits in the first few months. As the difficulty increases and new more advanced mining equiptment is created then the units we use today are less profitable, i would be very surprised if this miner is profitable in 3 years from now. This is why I believe over clocking is the best option in terms of profit. The difference between over clocking and not overclocking is Bitmain has found the most efficient speed to mail the miner where the hashing power compared when compared to power use is at its lowest rate. Overclocking just leads to additional power usage.
RE: Overclocking The Antminer L3+ 610 MH/s+ Comparing the EVGA 1600 to Bitmain's APW3++ ( Video)