have bought the same 16 of these marvels. This came in small inconspicuous plastic bags. As they came out of the van they were still cold and Knüppelhart. Therefore, first warmed to the heater and a half hour. and lo and behold it actually is rubber and not plastic. My setup: Denon PMA 520 AE stereo amplifier, 2x magnate Supreme 200 bookshelf speakers on Millennium, Canton AS 25 Subwoofer. My magnate boxes were first on my desk. Pucks been made under it and only once disappointed. Bass were suddenly completely gone and the height were so very present that it was uncomfortable. But interesting how much vibration transferred apparently on my table and absorb what this small but really pucks. Then I wanted it back down and have been somehow excited how strong the glue keeps them on the boxes. With a Kattarmesser we went though. In the cellar, I had a pair of old Millennium Speaker Stands from my home studio time. On this I then glued the puck and they still stuck like hell. On set, boxes on top and thought Wow. Freestanding sound the magnate now truly balanced and full in the spectrum. Then continue with the program. Subwoofer rotated pucks topsy re-erected. First I have to because it now sounds completely different from the Canton AS 25 completely new setting. Direct, dynamic and "fart" dry. He was previously directly with small felt pads on the package and boomed particularly in the spatial modes. That's now gone to 70-80%. Had the Sub indeed turn a total volume up, but since the resonance off the ground now come over lower frequencies really nice. Who has counted with now comes to 12 pucks :) the last 4 came under my PC (already strong on Silent designed) and also because they do a great job. Fans and hard drives vibrations no longer transmitted to the floor and the computer operates the same again much quieter.
Conclusion: So the bottom line is this small inconspicuous rubber pucks are a real force. I enjoy my music on a whole other level, since I have them. It's not that they do a better speaker (Brüllwürfel remains Brüllwürfel ^^), but if you have a good speaker can thus create the conditions that this also can show what it can do. For decoupling really well suited, and not only for speakers.
I here the product review 5 stars because everything is true what it says in the description and my expectations are fulfilled.
But as far as the shipping of Amazon, I feel that since I am no longer my prime customer orders are deliberately kept one to two days back. A few years ago (without Prime) you / I gave the order in the morning, in the evening it was sent and the next day it was there. Then I had tried Prime, mainly because of the movie streaming service. Since me this but disappointed by the selection, I canceled it again and since: the morning ordered the evening "your order is prepared for shipment" and then stands there like 1 or 2 days. If it is then sent once it goes with DHL always overnight. I wanted just once to get rid of, perhaps the watch still other customers !?
