On my much lighter Bergara HMR, there was a definite felt recoil difference between the Heathen and the Hellfire. I haven't sat behind this rifle with the Heathen on it, but it measured more, and it was an amount I'm sure you'd feel in a side by side comparison, but in all honesty, they all do their job quite effectively over an un-braked muzzle.
As for concussion, I'm only shooting 6.5CM so there isn't much of any of them. They're all distinctly louder than an unbraked muzzle. Looks like I'm in disagreement with
@kthomas on this one. In my back to back to back comparison, I couldn't quantify increase in volume or concussion. I did try, but I had no faith in the decibel meter apps I was using on two seperate iPhones to take readings behind the gun, and on the bench beside me, as they said peak volume was 85db. We know that cannot possibly be the case, so I abandoned that portion of the test early on.
I have not gotten my hands on any of the APA brakes, but I do know they rate really high among shooters and would love to try one.
For what it it's worth, the Jetblast stays on my gun full time now.
Also for what it's worth, I will be putting the Heathen on my HMR, since it's the lowest profile of the three and blends nicely with that skinny little barrel, and let's be honest with ourselves here. No one is getting separated shoulders from un-braked 6.5CM rifle recoil.