The idea behind the Boss was to tune the harmonics of the barrel, NOT to serve just as a muzzlebrake. If you are a reloader and willing to spend the time tuning and working a reload just for that rifle, you certainly don't need a Boss. The Boss though, is terrific for the person who uses his rifle for multiple different game, with different loads and either doesn't have the time to work up perfect reloads or doesn't reload at all.
It should not be confused with a standard muzzlebrake, they're two different animals and the Boss works great if used properly.