Don't forget that the Sorbothane(not Neoprene)need to/should be replaced every six monthsTab, if addressed to me, I agree. I replaced all twelve pucks about four months ago and it was like getting brand new GPA stands.
Alvin says change dampers about once a year but I've never waited that long to replace mine. The VTL amps are very heavy, I have to request special dampers so they don't get smashed flat and even then their life is likely shorted.
John, I agree the Carbon Fiber shelves are better, some people say a huge improvement.
What started all this was superior performance from turntables using Stillpoints and I wondered what their component stand would do.
I have two (new) JL Audio Fathom F-212 subs that have not even been un-boxed. Before they are put in place I wanted to do one more run at isolation of the amps as I suspect the floor around them will be getting much more of a workout than before and tube amps are particularly sensitive to shock.