The controlled method is using contract with TSMC based suppliers to aim the R.O.I
Currently, I only trust ASICMiner's, GPUs and Pyramining as Pyramining is doing the right job.
quoting pyramining: "Investing in Pyramining is indeed very profitable: the complete reward is estimated to be reached in less than 43 months."
To me, this is definitively a scam. Pay first, get your money back in 43!!! months :-)