My Pursuit XLT had one and I didn't like it. Not that it was difficult to clean but just an extra step I had to do. It also left 4 gouges on the base of my sabots.
I was at the range last week and the guy next to me was shooting a rifle with a muzzle brake. After his first shot, I thought he was shooting a BMG it was sooo loud and the concussion I felt thumped me pretty good. Come to find out, it was a .243 with an adjustable brake.