Granit amp stands are they killing my sound?

I'm using Granit platforms as amp stands is this a good idea?
Thanks Syntax. Those results seem impressive. Are your amps the Lamms with tubes, SS or hybrid? Do you think the most improvement with the VP would be with tube amps or would SS also benefit so dramatically?

I'm thinking of getting two of the active units with a compressor in the basement.

Sorry to sidetrack this discussion about granite amp stands.
You shouldn't need to locate the compressor in the basement (if you're going to use a compressor like the Jun-Air). My Vibraplane's compressor is so quiet, it sits out in the listening room, no more than a few feet from my listening position - even if it happens to kick on while listening, all you hear is the click of the relay tripping, it runs for about 20 seconds, and that's it. I believe they were designed to run dental tools - sharp pointy instruments and sudden loud noises don't go well together! Aesthetically, the compressor is a bit of a conversation piece too.

Are you using the Vibraplane under your Galibier or for something else?
Hi Dave,
Yup, under the Galibier. I ditched by sandbox in favor of a mass-loaded active Vibraplane. I'm using two sheets of 3/4" aluminum on top of the Vibraplane for mass loading to get within the optimum range of effectiveness, or around 250 lbs. The difference is not subtle.