I don't only use it as a pure octaver, but I found its best use keeping it always on with a minimum low&high octaves volume, letting it add a bit of dynamic and brightness to my regular sound.
Used as intended, this kind of effect is a bit limited... don't get me wrong, it sounds good and it definitely has its rare use-cases, but it gets boring in my opinion after a bit of time.
Also, I will test it better when I'll soon get proper monitor speakers, but in my case (may be due to the fact that I keep it pre-distortion) it is quite difficult to balance the pedal to have a "spot on" range on the lower octave.
Construction-wise, the pedal is quite compact and sturdy... a well made little box!