I have tried a lot of wah pedals, and this is the one that works best for my high-gain applications. Simply screams, with a deep enough bottom end and a not--overly-piercing top end and plenty of midrange. Great as a solo boost with that midrange-Schenker kinda thing. Contour knob is a big plus, and the optical switching is fantastic, never have to worry about accidentally not turning it off or on. What more could you ask?