nickif - to me your statement is arrogant and offensive. You are proposing that we part with substantial amounts of hard earned cash based on belief that denies everything we have learned at school and uni. And everyone who is not a "believer" is automatically arrogant or lazy.
Some of us prefer to allocate our cash in something that we understand rather than believe. Please respect this choice.
And this believing would be helped if some of the magic cable vendors offered money-back return policy. So far I haven't found any that would.
Thecableco.com carries many different cables and you can "borrow" from their lending library to test. Not sure if overseas can.