I've seen people getting parametric EQs because they have read silly articles on the internet claiming parametric gives you more control than graphic EQ. Needles to say, most of them get very disappointed.
Well, this is NOT a replacement for a graphic EQ. This is a special use tool which will let you attenuate (or amplify) one specific frequency band. Basically an active band-rejection filter.
As for this pedal, well, it does its job and it's the only parametric EQ in a really affordable price range, but it's definitely not professional as it claims to be.
The box is sturdy metal, but the button, pots, and especially the battery door look very cheaply made. The frequency knob is marked 1 to 10 instead of real frequency values and this is quite dumb. The width and gain knobs are super tiny and impossible to grip, let alone read their values. Why didn't they make 4 normal size knobs is beyond my understanding.
All in all for such a price its a good deal, I can't complain. Compared to other parametric EQs this one is dirt cheap and it's a no brainer to give it a go. It's interesting to combine with distortion pedals, you can make humbuckers sound like singles and you can get some wah-y sounds too.