It's a copy of the Boss tremolo: Sounds identical, it is immediate to use and probably has everything you want in a tremolo: smooth transistion from triangular (i.e.: classic) to square (i.e.: on-off) tremolo, responsive depth and a good range of frequencies getting into infra-sonic territory.
The only setback could be the build quality but it's the only thing that differentiates this pedal from the Boss from which it derives, and arguably this will be less resistant to gig abuse, but you could buy 3 of these for the cost of a used boss tremolo, so...