I've tested many compensator's before and after, including the XB5... I can detect no difference before and after... I suspect that the lowest common denominators are the shooter and the ammo... BUT, it certainly does not hurt accuracy, it looks good and it protects the crown... there are legitimate reasons to use compensators... in speed shooting, even with rimfire, there is slight muzzle movement, and compensators do help... the XB5 and other "forward-blow" type compensators keep the gases moving forward and do not increase the noise realized by the shooter.