I've never fired a firearm with any kind of brake on it but seeing videos of them in use made we want one. A couple months back I picked up a Battlecomp brake and just today had a chance to play around with it. This brake is amazing, it completely changed the character of the rifle. I fired 5 rounds and had to hand it over to my Dad who was shooting his rifle with A2 flash hider attached. He fired a few rounds, looked at me, and then proceeded to empty the magazine. It's a different experience shooting a Battlecomp brake. There is a bit of concussion that you feel but it's nothing major. What's amazing is the ability to fire the weapon and still be able to see the target through the aimpoint. Rapid follow up shots can be made easily. Now I know how those guys in the training videos do it.
A Battlecomp or something similar will now go on all my AR platform rifles.