They are most definitely an effective isolation device, although they are not the only isolation device I use.
As for amp use, I currently have my amp stand spiked directly into four Aurios, also have my amp sitting on 2 Aurios on top of stand. Spiking the stand into the Aurios was a definite benefit vs. Aurios only under amp and amp stand spiked into floor.
As for amp use, I currently have my amp stand spiked directly into four Aurios, also have my amp sitting on 2 Aurios on top of stand. Spiking the stand into the Aurios was a definite benefit vs. Aurios only under amp and amp stand spiked into floor.