Pshaw...still have yet to see one of these expensive brakes do anything better than a Tapco slot brake will do, it's marketing hype, muzzle devices have been around now for centuries, and they have tried every imaginable design. Simplest still works best for the most part.
I run a simple three-prong on my Vepr that I bought for 7 bucks from Northern gun parts, looks like the old original M-16 flash hider, works fine at hiding flash, and actually provides some braking ability.
But bottom line: The AK round is easy enough for children to handle the recoil, it doesn't do shit to a full grown man, i've had someone video me with high-speed camera shooting an AK on several occasions now because we were curious about this very subject, and even with NO muzzle device there is almost no perceptable muzzle rise, nor rearward movement of my upper body except for right at the point of contact with the buttstock and that was less than an inch or so.
Fucking Tapco slot brake will actually drive the muzzle down, damn thing works great, try it for keeping mag dumps on-target, it's a hoot.