I have not used this pedal a lot, but it did the job! It is made of rugged plastic (bakelite or ABS, maybe), matte black with hard rubber bumpers at all contact points, including on the top and bottom. Not too light, not too heavy, just right, in my opinion.
Its mechanics is excellent! It doesn't oppose too much resistence, but it neither slips out of control, and wherever you stop it, it stays right there. I would not change absolutely anything in this respect, period. Hopefully, its dynamics won't change with use :)
The volume taper is good, too. Presuming one uses it correctly, after the gain stages / preamp (in the FX loop, if available). It is smooth and it is easy to fade in or out, or cancel the pick attack to make strings-like sounds. Maybe at the bottom volume it could be just a little more precise, but fading out can be done smoothly all the way with a little care.
I cannot talk about its durability because I have not used it for long, but I have brutalized it a little doing cello tunes, and it didn't break. So far so good.
The rubber on the bottom could be more sticky, it slips a little over my shiny floor.
