I got one recently, have not had much time with it (really one outing) and shot about 20 rounds through an 870 pump. I used low recoil / low noise 12 gauge shots. It is quiet (not hollywood quiet), but I did not need hearing protection and no performance issues in a pump. Biggest drawback is size and weight. In the full 12 inch configuration, it is a monster at the end of the barrel. You can buy a kit to make is shorter / lighter, but that sacrifices sound suppression. I'm thinking of doing a bull pup kit to keep a full 18.5 inch barrel but not have the weight so far out from my body. I really need to spend more time with it to give it any more of a review.
"The two enemies of the people are criminals and government, so let us tie the second down with the chains of the Constitution so the second will not become the legalized version of the first." ~ Thomas Jefferson