Apart from the small size, the auto-return (auto-switch off) function for which you can adjust the delay time "under the hood" from 0 to about 2 seconds when the pedal rests in the "heel" position, the max 16dB boost, the adjustable-to-taste range and Q, this mini wah is entirely quiet whether it's ON or OFF. Which was the reason I bought it in the first place, because my other mini Wah (Joyo) makes a lot of noise in some positions in the effect chain, depending on the pedal(s) next to it.
In this case, I placed it in first position, just before the Digitech Whammy and after the Guitar Output of a Roland GR-55 guitar synth.
The build quality is solid, the mini pots feel sturdy, including the microswitch for the frequency range.
The rubber underside gave me some doubts whether velcro-tape would sufficiently stick, but it did.
Inside, the little knob for the auto-return-delay is operable both with fingers or a small flat screwdriver and feels quite sturdy as well.
Its sound is instantly recognizable as a Cry Baby and just ROCKS. And if not, it's adjustable ;-) I love it.