The ultimate double blind study I saw was done to prove how much of a crock this cable sales are.
My uncle found it a few years back, and I cant seem to find it again, so you will just have to take my word that this was credible study.
They tested the top of the line MIT cable vrs cloths hangers tied together. The results were a Tie. Sorry, but the only ones claiming fowl are the ones that wasted their money on this crap, the ones making the crap, or the ones selling the crap.
Everyone else sees it as crap.