Judging someone or a product is possible AFTER trying the product...
If someone think that the written science with no further experiment explain anything about sounds experience, he is deluded...
Like scapegoating, claiming fraud or scam is the easiest thing to do when we dont want to experiments or dont need to...
I never recommended anything costing more than a few bucks... For me the organized "scam" is sometimes the refusal to experiment and the continuous insistance on "electronical design measured informations" to be the ONLY valid facts to know... The "upgrade urge" everywhere push by all magazines is the most evident potential scam for me....
With no money, i never had the choices anyway, save to experiment with peanuts cost solutions... Total success...