Mystery feet vs Townshend pods vs Isoacustics

I am curios to know has anyone compared Mystery feet from Marigo labs with Townshend pods or Isoacustics pods and is there big difference between them? At the moment I have two sets from Marigo Labs (on loan) under my preamp and cd player and they make the differnece for the better. I have tryed Finite Elemente ceraball and cerapucs, but did not find them near as good as Marigo. Using basic Finite Elemente rack, tube amp and premp. Thank you.