since quite a time I am using the hand build racks of Copulare. I also put vibration measurements (ArtDificial Coral) of the same company under my tables etc.
As Copulare is over 30 years in the market many copy cats have tried to establish an image on behalf of Copulare. Other brands, especially in the US or Asia have continued on the tracks Copulare was laying.
Some special masterworks like the one above show the fully skilled handworks of the table platform, underneath dampened with layers of birch wood and sand.
The used material of Copulare is of high quality as you can see here on the opening of one stand. You may open it and fill it with sand or some other more heavy material to put more weight on the side.
Regarding the effects you have on your musical enjoyment there might be even more sophisticated and more expensive projects other companies advertise.
I am quite happy with the Copulare stuff I got and may motivate one looking for some serious and innovative design on audio racks to get in touch with the builder. One advice, stay away from some exotic designs like the Mozart-Table…