anyone familiar with aurios isolation

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.

Mrtennis, I agree there is a reduction in noise and increase in focus with the Aurios and other metal ball bearing isolation devices such as Cerupucs, Cerabases,Final Labs Durumas, I also hear an increase in air/spaciousness around images with all the metal isolation devices. I've found that isolation feet made of other materials, such as sorbothane, rubber, Herbies, BDR cones damp that air/spaciousness to some effect. All have their place in my system, its just a matter of tuning to your liking.