Stillpoints - snake oil?

Stillpoints are best used under speakers. Then if you’ve got plenty of dough, try them with your electronics. 
I’ve found they work magic with my Focal speakers on a suspended carpeted floor but less so with my Simaudio 700i amplifier or CD/DAC. 

As a machinist and field tech. I spent a great deal of time analyzing, identifying and eliminating vibration in complex, rotating industrial machines - everything from high speed turbines and planner heads to large, low speed scrubber fans and everything in their connective drive assemblies and surrounding structures. Aside from out of balance, the major causes of what could be, or become destructive vibrations, was the same as we see in audio - looseness anywhere in the system; all orders of harmonics as related to the resonant frequency of the machinery; the transfer of outside vibration or interference. For issues, other than out of balance, the solutions to eliminate vibration were the same for a 10 million dollar turbine, as for a home audio system - address looseness, couple to reduce or control resonance and isolate to reduce or eliminate outside interference.
I agree with Elizabeth’s earlier statements regarding cheep, sensible methods of addressing these issues. Once you understand where the problem is, it doesn’t have to cost a thousand dollars to solve the problem....Jim

Jim, thanks for that information. Understanding the problems vibration creates in our audio system there is no reason to doubt that these devices do work as designed. 
Listen first to decide if they improve what you hear in your room. 

Mapleshade heavyfoot(feet) anyone? Their considerable mass seem to me to be a strong selling point.