well for one it does balance the bow.. it will make you have a steadier shot. but it will also quieten your bow making it not as loud when you shoot at deer.. that alone should be one reason to get one.. btw do not get a sand filled one if possible.. that just helps with balance.. you need one made of gel/rubber/silicone/navacom to have a noise reducer effect..plus it reduces vibrations felt from hand shock which in turn helps with accuracy i suppose.. may even help your bow last longer (maybe just a guess)