I do think pendulums work and work well. I have used a Preditor IV for 5-6 years now and have had no problems. It is quiet, bright and from 15-25 feet up I can shoot from 0-38 yards dead on! One pin no quessing! I shoot a new bow doing 265-270fps and do 99% of my hunting from a tree.
I have a fixed pin sight that I shoot for most of the year but come August 15 on go's the pendulum and if I know I will be hunting on the ground I put the fixed pin sight back on!