I had most of the original Prescription Peddles including the Experience peddle, Vibe Unit, tremelo, etc.. The difference was that when they were first made, the owner made them by hand and gave each one a wild and unique dripping paint job. Very Hippy like! Mine was in purples, yellows, blues and reds. I sold the last of my peddles a few years ago except for a simple Danelectro Echo. I usually play through a vintage Fender tweed vibroverb . That gives me enough tone for my needs.