I personally have not tried one, but if you go to youtube, Nathan actually compares his brakes against many other popular brakes (including the painkiller) on a sled, with several different rifles from 6.5's up to big bores, and his beast brake outperforms the painkiller, and pretty much any other compareable brake in recoil reduction. The PK brake still does an absolute fantastic job, and it is not outperformed by a huge margin by any means, but if you are splitting hairs, the beast wins. When selecting the most efficient brake possible for my light .338 nm, I did a lot of reasearch and watched many different videos of side by side comparisons, I didn't want an expensive gun that was painful to shoot. My research consisted of the Terminator series brakes, the APS Painkiller, the Bastard brakes, the PVA brakes, Ross's brakes, the Christensen Arms side port TI brake they put on their big guns, and a couple other ones I don't recall that were recommended to me. With every direct comparison I could find, the beast brakes always came out on top. So, I went with them, and I am happy. The percussion is significant, but that has never bothered me, and the recoil reduction is outstanding. Like I said, my 8ish lb unbraked .308 shooting 168's has more felt recoil. Could be partially due to the stock design, a sporter stock on the .308 vs a Manners EH-1 on my .338, but it is still less.