I would love to hear what someone who’s actually purchased one of these thinks. Until then, it looks like another overengineered gimmick to be honest. At $13, it’s not much of a risk though. I got the feet from Bambu and they did not help or hurt, the just fit poorly and ended up falling off each time I tried to move the printer so I got rid of them.
Although I am not an expert in vibrational analysis, from my experience in creating systems meant to withstand vibrational harmonics onboard moving vehicles for the military, there are two schools of thought. That being, vibration attenuation which these feet seem to try to accomplish and then there is vibrational isolation.
We discussed some of this in another thread not too long ago.
Since that thread, I’ve stumbled across a number of solutions that appear much easier to implement using squash balls.