I have the rev 2 casing (solid red with yellow stencil painted markings) with the internal components updated by Montez (owner/designer/builder) to the rev 9 board with the pro-chip. It more resembles their "hand-wired reissue" without the side switch. This pedal is incredibly transparent and is a wonderworker for my stratocaster. Since the updated board, it's more friendly to dual coil pickups, but this compressor can be a little selective by my evaluation. There is an internal pot to adjust for input gain which helps a great deal. If you come across an older style pedal, you can contact Montez and he'll update it for around $70. If your wheelhouse is strat/single coil guitars, then I don't think you'll find a better comp. The best way I can describe is to say that it doesn't place an "effect" on my strat tone as much as it brings out the best of it. Highly recommend.