Looks great. I put some under my sand and lead filled stands only because I didn't want to keep scratching the timber floor with my spikes. Because of the considerable weight of the stands i wasn't expecting any difference in sound at all but as it turned out there was an improvement in the highs that was undeniable. I wouldn't be surprised if you had similar results.
The improvement is not only in the highs, it is over the whole frequency range.
Just about the same as in the you tube Gaia demo’s