I hate them,i can not shoot more then 40 yards and hit where i want it to,if you are having roblems then buy a range finder and keep your other sights becuase pendulums are to much haslte. If they where not then the pros on all the movies i watch would be using them. I have only seen one erson use them in a movie with bows on it and he missed the first time and hit him the second time.