Boss = waste of money,time and noise IMHO. With the quailty factory ammo made today and improvements in bullets,powders and guns, I see it as a selling gimmick with little true value as others have stated.
I wouldn't trade the added noise,weight and cost in smaller caliber rifles for coyote hunting. If you want recoil reduction go with a medium,heavy barrel. Accuracy is gained better in other ways than a "do dad" on the end of the barrel of a coyote caliber rifle.