Well I've lived with my Grammas for a few weeks now and must say I'm very pleased with the result! They did just what I was hoping for, effectively decoupling them from my thickly-carpeted wood floor while providing a stable-enough base for the speakers.
I deliberately waited till the Rave to put the speakers on the stands for the first time, both for the extra muscle and for the extra opinions.
It was pretty universal I think that the sound got much better w/ the Grammas in place. Largely gone is the sense you feel in your bones that the sound is being drilled down into the floor, giving a greater sense of ease to the sound with less listener fatigue.
A very worth-while $90 improvement!
-Mike