I do not have any direct comparisons to other breaks, but I believe it does work very well. A few of us have shot the vz.58 (with and without muzzle breaks) and our vz.58 muzzle break reduces perceived recoil and muzzle lift. In my opinion, it looks cool, the Czech military uses it, and it works well. And, we buy our muzzle breaks from the same manufacturer who provides them to the Czech military.
Dan