I bought one and practiced with it all summer. It was fine on the ground but when I got 30 feet up in the air it didn't seem to hit where I was aiming. Not sure if it was hitting low or high, because that was a couple of summers ago, but there was no way that I was risking a bad shot on a deer. I switched back to my old sight. My brother has used one for years with success and swears by them, so I guess it's in the eye of the beholder.