I use pedals for many years. I had seen at the foot of Blonde Redhead in 97, and a lot of group before. This pedals is simple, effi ... and was widely trs rpendue before MODELS fender and do their boss comes in and does their cot sduisent chic. I had other tuners before, but not the format pedals. Benefits, it fits perfectly the environment of the coup of my other effect pedals, can use the same power supply ... Out in position 2 (bypass the signal during the tuning), if the power supply is via a transformer, the pedals (at least mine) transmits an plop not necessarily enjoyable ... So, on scne, I leave the lights permanently and Out1 ... Class is less because the public hears me give me time to time, but it avoids the plops ... We can adjust the tuning and 440 + or - above. I like the pedals and look cheap. I would not hesitate remake that choice.