I have an Outback that I put a Toxonics Sniper Pendulum on. I have used this sight for two years on another bow and have been extremely happy. It has the pendulum for 0-30 yards and two fixed pins for longer distances. No noise at all. As far as shooting straight down, the Toxonics pendulum will only swing so far and then it stops.

I can't speak for other pendulums but I can definitely recommend the Toxonics.