I have one on a .416 Rigby. It is ugly, cumbersome, etc. etc. However, it does a good job of reducing recoil, and this particular make (Vais) does not raise the sound or muzzleblast level to any noticeable degree.

The rifle had it on when I bought it. I would NOT buy one for any of my other rifles, but I will continue to use the rifle with the thing in place..

(BTW, these things are BRAKES, as they apply a braking effect to the rearward movement of the gun. To me, the term "break" implies that something is broken, or hinged in the middle, like a "break-open shotgun", etc.)