I've been using Brightstar under my Integrated and my CD player with (IMHO) spectacular results since day one use and it is sonic improvements that you can hear!
Best isolation under a big receiver ?
I have found the gingko cloud to be great under my cd player, and am perfectly satisfied with it. But i have nothing under my big b&k avr307 receiver except the shelf it sits on. I know it is not as sensitive as my source, but i would still welcome your thoughts.