It's so good that I chained 2 of them on my pedalboard. .the first one in boost mode - gain at zero - it opens the sound of my Fender Pro Junior :) .the second one in overdrive mode - bluesy and thick as I like it :) One flaw - common to all pedals - the price :) Precision: it is made of "heavy" stainless steel, which is good and more reliable, if it doesn't work, you can knock out with it. :)