I bought a pendulum sight years ago, probably the second best thing I bought next to my overdraw.It takes all the guess work on where to shoot and which pin to use.once sighted in 0 to 30yds it is right on although I like to keep my shots 20yds or less.I guarantee if you ever try one you will never go back to pins shooting from a tree.I also never try to guess if a deer will lower itself when I shoot.I put the pin on the money everytime.the first time you try and shoot low you may find the arrow sticking in the ground below the deer.that is why I take all the guessing game out of shooting from a tree with the pendulum sight and aim on the mark too much thinking going on to add to your all ready heart pumping, knees shaking,nerves about shot to add anything else to the fire.just my 2 cents take it or leave it.good luck this year.