My buddy put one on his AK yesterday. It does a damn good job at suppressing flash (about on par with an A2 on M4), recoil and muzzle rise. And it isn’t louder for the shooter or bystanders. I can’t imagine there is a better muzzle device for the AK(except a can) at any price. This was in no way scientific.
i have one on my wasr. recoils staright back more more than the slant. and from what i could tell(i only have maybe 350 rounds through it) there was a decent reduction in muzzle rise. i mainly wanted it for flash hiding first…anything else is gravy. its cheap and im pleased so far.