I got this pedal to replace a lost Boss tuner, all I needed it to do was what it says and mute my signal when I turned it on, for 138dk this is the price of a clip on tuner and should have been a home run.
Unfortunately there is a loud and unbearable pop everytime you engage the tuner, this fundamentally makes it worse than a clip on tuner and literally unusable in a signal chain for live or recording. I was greedy in thinking this would be all I need and now have to buy a good tuner and take the 138dk on the chin.
For the record, the tuner works fast and is accurate, the chasis is metal and feels solid. Screen is clear and easy to read. As long as you play straightforward tunings in 440hz and dont care about the fact that it makes your signal noisy and pop whenever you turn it off and on then, yeah, this is fine for kids, home enthusiasts and band practice (if your peers don't have sensitive ears). Unusable in any intermediate or above situation.
Hope this helps, J.