What isolation feet under your amp with great result?

The vulcanized rubber hockey pucks are way harder than typical rubber footers.  Anyone else have a clue as to their damping abilities vs. other typical options discussed here? 
I would be interested in trying them under my 70-pound amplifiers, which sit on SRA platforms.  The SRA guys said it doesn't matter which footers I use when using their platforms while the amp designer strongly suggested Stillpoints so the amps are currently on Stillpoint footers over SRA platforms.  I have no sonic issues but it seems I could use the Stillpoints under some of my more sensitive front-end gear if their use under the amplifiers is redundent.
The Machina Dynamica springs mentioned above are also interesting to me and while elegant from an engineering perspective, not so much visually.  I believe these are valve springs for small engines.  The trick is finding the right spring for the weight being supported.

I have tried hockey pucks before, and the footers I recommended ( also from Amazon ) are, imo, superior......in place of the feet that come with the amplifiers, not in conjunction with them. BTW, for naysayers of isolation feet, isolation can happen inside the amplifier as well. If possible, isolate the power transformer, whether it be an IEC type or Toroid, from the chassis, using a product such as cork, a layer or two of Dynamat, rubber grommets, whatever, and it changes the sound, again, imo, for the better. The HK Citation 12, 16 and 19 power amplifiers all had rubber grommets of sorts, isolating the transformers from the chassis. So many other designs did not. Tube amp designers do not do this ( power and output transformers ), as it is beneficial, with sq, ime. Doing this, cleans things up a bit, an improvement, greater than a fuse change, imo ( and I believe in fuses ). Just saying. Be well, all.

Thanks for your insight....Interesting....My best Mrdecibel...

 I have order 3 sets of your footers.... Ridiculous price.... :)

I will try them when i will recreate my audio system....

@mahgister....when you receive them ( Amazon ships quick ), experiment with the placement of them under the component ( s ) before you peel, for the adhesive. In fact, you do not need to use the adhesive.....Enjoy !, and my best to you, as well.

three easy payments, I believe that ebm is describing to use the Critical Mass Center Stage as footers under the amp and, thus, between the amp and the Ultra Stealth platform.  That is the same method that I had described in the page 1 of this thread except I use the same brand (Symposium Acoustics) Rollerblock Jr + footers.  They are less expensive than the Center Stage footers and, IMO, provide excellent vibration drainage from the amp and directly into the Ultra platform.  You can contact Symposium Acoustics directly, speak with Peter (the owner) and he will provide excellent information and help to you.
Good luck.  Be safe and be healthy.