Keller makes a real nice pendulum. I personally shoot the Trophy Ridge Mantis Guide Series with LED pin light. I chose that over the Keller just because it seems to have a more rigid mount and it has measured increment marks for adjustments butfor almost half the price the Keller is a great deal.Ive been bowhunting 26 years and just find it a littleeasier not to have to worry about guessing yardage, making sure you bend properly, etc when using regular sights. Sometimes you dont have time to use a rangefinder or just can make that much movement when theres a bunch of deer under you or dont want to risk it, or cant bend properly as your trying to lean one way or squat tomake sure you shoot under thatone limb right in your shooting path, so many variables that happen you just never know. If you mainly tree stand hunt then I think they are great.