Don't know about all pendulums, I've been using the Predator IV from the start 7 years ago and it's about the only thing I haven't changed. It works and works well. I hunt a property that has 9 different stands, no two a like. I often use a climber to hunt out of as well. I garantee that this pendulum when set up properly is deadly at any yardage within 35 yards at any shooting height from0-30 feet high. The draw back is it takes some time and a 15 foot high stand to sight in from. Well worth the effort in my book.