Of all of the Harley Benton Pedals that I've had time to play, this is probably the most impressive. This is a very impressive compressor. It handled the vintage pickups in my American Tele and the super high output hot-rails in my strat very well.
The sound is the classic sustainer type compression, the variable attack time being very useful to help shape picking dynamics. It's not the cleanest compression I've heard, but any colouration I could hear seemed warm and very complimentary to my single coil guitars. I've yet to try this pedal with my bass rig.
Build quality is very impressive, and not just for the price point. The enclosure is high quality die-cast aluminium and is well finished (though the graphics are a little cheesy). Having had a snoop inside I was pleased to find a quality 3PDT footswitch in a true bypass configuration. The pots are pretty decent too, as is the quality of the off board wiring. The construction quality of this pedal is easily the match of some boutique manufacturers.