They have worked very well, they were designed for shooting from the prone. To direct the muzzle blast up and away from the shooter and spotter. Anyone to either side of that zone is going to know it, as is the case with all muzzle brakes. This one is just more driver friendly than most I have used. I have even tried it on my 6.5 Badger (6.5-.338 Ultra Magnum Improved) which it wasn't desighned for and it took quite a bit of jump and recoil out of it.