having used granite bases with silicon infill, iroko wood with quasar points under my speakers I recently had the chance to try these platforms under my speakers [b&w 804s] having tried the sonority design roller shelf under my cd player and being very impressed . stephen hitch the designer came by and set them up. I had the extra base which costs extra but essentially it is one layer on ball bearings with this next layer on spikes. very precisely engineered. we listened to various tracks with my platforms and his, and first impressions was much better bass control and instruments were clearer. having spent a week intensively listening to these platforms I am impressed. Roy Gregory writing in hi fi plus says "you get a blacker background [ i found that you can listen at lower volumes and still hear plenty of detail which has pleased my wife] leading to better separation, crisper dynamics, a more natural sense of pace and flow. " "Bass is tighter and deeper although not weightier , leading to a quicker sound with an increased sense of momentum" I am not sure what the last bit means but I can concur with all this. The bass is so well controlled. I wanted to be sure so took off the speakers and put them back on wood with pp and it was evident how boomy and coloured the bass was on many tracks. the sonority rapidly went back under , I was half hoping these would make little difference so i could save the considerable cost of buying them but they really are rather good. Tracks used were Lemon jelly vangelis `the city` klangwelt Gert emmens [electronic ] indra kraftwerk. they are well worth a free demo [URL]http://s247.photobucket.com/albums/gg160/phil125/[/URL]