I decided to give S1's brake a shot on my new 338 Lapua. Read about the gun here: 338 Lapua
I must say I'm impressed. First, I couldn't find a line between the brake and the barrel. For a minute I thought he may have welded it on and then turned it down. It indeed is threaded. I watch the line literally disappear when I install the brake. As for effectiveness, the torquing of the rifle upon firing is entirely gone (was quite bad before) and now I can't tell the difference between the recoil of the 338 (17 pounds) and my sniper's hide rifle in .308 (16 pounds). Some may not like the guy but I've yet to hear anyone say anything but good about his work.