Gents, no offense intended or taken. I simply have not enough time or money to try every audio gizmo without some basic understanding of why, how and to what extent it works, and whether it is intended to address a specific "opportunity" with my current setup. Same is the case for dietary supplements, fitness programs, investment plans, etc...
In this case I read through some of the available literature online and cannot convince myself that this stuff works at all or that its effect is perceptible by the human ear. I am an engineer with some grasp of vibration theory and signal processing, including Fourier series etc.
As to subjective evaluation, in my audio experience, when you have a very good system to start with, and you are introducing a subtle tweak -- not a very different speaker or an amp of a different performance category or bass traps etc. -- the only reliable way to evaluate its effect with no placebo effect requires: a) blind A-B-A auditioning, and b) immediate and brief back to back auditioning - e.g., a 5 sec. segment repeated within 1-2 seconds. These are impossible to accomplish on our own.
Of course I could be wrong. And of course it could be that I am currently complacent and content with our sound quality and happy to just enjoy the music and not chase the ever receding horizon of promised improvements...
Cheers.