I have some indirect experience with one having fired it on a friends DD MK 18. Two observations. The top hat is a nice design for shooting a straight brake closer to people as the concussive force side to side is less than a BattleComp, but not worth the extra expense at all. The recoil reduction compared to any other brake (Surefire, BattleComp, Triple Tap etc.) was nominal.
If you’re going to run a can why not buy the brake associated with your can instead of buying the War Sport and having to essentially “throw it away” when you have your can?
Buy a Surefire brake (great brake for less money) and then buy a Surefire can and call it a day? The same can be said of AAC although their Brake and Brakeout aren’t as effective as the Surefire.