i am sure they work...
I cannot afford them though...
But my homemade recipe work well for me ...i will not pay many hundred dollars for 150 bucks speakers ...😊
But i discovered long ago that many people upgrade their gear without being conscious of the huge negative effect of vibrations/resonance on speakers as much as on turntable ...
The main point of interest is nevermind the means used, vibrations/resonance problems rival electrical noise floor problems in impact but they are more underscored or adressed and often with the wrong products ..
Just to add a bit of a twist, I have found the Critical Mass footers underneath my components to be a real eye opener.
ozzy