It's been over a year that I lug around with this tuner on my pedalboard and despite what some say, I think it's a product that is honest about forty euros opportunity ...
The first big advantage: it is a TRUE BYPASS. If the power supply fails, the sound goes anyway.
The second big advantage of LEDs that give a huge display extremely clear and bright. And besides, it's beautiful!
Advantage 3: When the pedal is pressed, it cuts the sound out COMPLETELY. So, I'm using it as a "circuit breaker" to transfer everything that is downstream of the guitar. Handy when you must disconnect his guitar to plug in another ... Moreover, when the pedal is awaiting a signal, it flashes. We thus see immediately when she is engaged. Before a concert, it became a habit, I always lights: I no longer touch the volume knob on my guitar!
Advantage 4: The switch itself is strong. One feels that triggers a true-bypass.
Disadvantages: With its 4 directions (right note, our too low / too high / sharp), it is not the most accurate, of course, but enough to allow tuning in the heat of the action ... .
Taking the power supply is placed on the right side of the pedal, next to the input jack. It's quite unusual but in the end, plug the power supply is well protected by the jack.
Here, finally, for 30 or 40 euros, it would stupid to deny it.
Of course, you can buy a Boss, but it is twice as expensive ...