I bought this to add a percussive element to my guitar playing, without having anything too distracting.
Overall, it does what it says absolutely fine. Seems to be built solidly - saying that, as a product designed literally to be stomped on, I would certainly expect it to be!! However, I'm not the heaviest user of it, so those gigging with it may test it's strength out more than I do.
You really do have to give it a good kick to get some sounds out of it though. I was running it through as an auxiliary input into my main amp, and even with the volume high on the channel I wasn't getting much thump. I then plugged it into a separate amplifier (my old practice amp) into the main input, and increased the gain, which made it more sensitive. Problem solved.
Difficult to review the sound really - you want a good thump, and once your amp is set up right, it does give one. No qualms there.
Overall a good purchase, and something a little different. Quite expensive for what it is, but as long as it lasts, I don't think it's a bad investment.