I have a VPI Prime Signature. I could not stand the "hard" sound from the bare platter. I got the 3mm Achromat, I use the peripheral ring and the sound sweetened up and became more musical. VPI claims the paper shipped on the platter is supposed to be used as a mat also. I don't know what they listen to, but I want musical music. I had heard about the Achromat on many forum threads, but Michael Fremer's review was what sold me.