I have two of them. One is on my Remington Sendero SF in .300Win Mag. The other is on a Winchester Classic Stainless in .338 Win Mag.
The "system" incorporates a special spring recoil pad - that really works! The MBs are essentially a series of numerous smaller holes. The company says that numerous smaller holes are more effecient than fewer larger ones.
All I can say is that recoil is GREATLY reduced - even more than my Vais Muzzle Brakes. HOWEVER, the answer brakes, at least in my opinon, are MUCH LOUDER than the Vais.
Another thing I should mention is that they do SUPER HIGH QUALITY WORK! They bead blast the MB and the barrel. Even up close, it looks like they just drilled holes in the existing barrel. However, when you twist the brake, you start to to see that it really is a different piece.
My conclusion? It works VERY well, but it is VERY loud. Personally, I won't put it on any more rifles because of the noise.
Zachary