(These devices are unable to get rid of the real elephant on ones room, i.e. excited room modes - the most critical type of rezonance in one's system. Consequently, I am of the opinion that one should take care of those type or resonances first before starting to debate the benefits and superiority of various fine tuning devices.)
That's a fairly profound and perceptive statement. That is the reason why I worked with SS technology on designing a room with mechanically grounding in mind so as to "manage" room energies. The walls were treated with their proprietary technology and not viscoelastics from the 80s....:/
More information will be available with a formal system thread of mine and a subsequent review in the not too distant future....