It is a boost ...

UTILIZATION

Config simple: two jacks, a knob and a switch ...
A graduation and a knob a bit less sensitive, however, would have been a plus.

SOUND QUALITY

While there, I love it!
Gradually, this little pedal I become totally indispensable.
I use it early in the chain. Initially, I just wanted to boost the drive channel of my amp (which also works very well).
But ultimately, I also use it regularly on the clean channel. With humbuckers, and I get a slight crunch.
And with a Start or Tele, I get a warmer, more mellow, with even more dynamic, without any distortion either. MA-GI-QUE! Very good!
I can not consider myself out of this little trick!

So in terms of defects, one might say it is not totally transparent ... but Me, I prefer to put that on behalf of its qualities as it brings a little something I found ... spellbinding.
In short, this is obviously subjective, but as level grain level gaming experience, I think it's great.

OVERALL OPINION

I use daily for 2 years.
I tried other models, but it did not have this "mojo".
Level value for money, nothing to say and do it again if I buy it back of course! A real discovery, this pedal!