I have the VR series under my Lamm amps and the difference was very significant. Increased clarity with better defined images. Bass goes deeper and tighter. These make such a difference that I consider them a requirement.
What's under your amp?
Interested in hearing the importance (or not) of isolation platforms for amps. Check my system, you'll see I've got my Cary's sitting on top of my cabinet, which is a custom piece made of solid cherry. Very solid, but I'm wondering if maybe the cabinet is introducing vibrations up into the amps, and maybe I could use some help from a platform?