Now before subjectivists start to celebrate, as I clearly noted, none of those mains components are remotely audible (or you would hear them with generic cables and we don't). And at any rate, no improvements were made whatsoever in actual distortion products. In the case of D50, we actually made things worse a bit.
I guess it is good to find things that we think are totally waste of money, actually produce some measurable improvement. For $100, I wouldn't make fun of anyone buying one of these unless they started to say it made things sound better.