I have shot a pendulum sight for over 20yrs and love it. Most of that time it was a Keller but recently I bought a Trophy Ridge Mantis with v-drive, no longer made but available on ebay, and I like it even better. The advantages of the trophy ridge are more adjustment when you are shooting on the ground. I don't think there is anything better when shooting from an elevated stand than a pendulum, just aim and shoot, just like shooting a .22.
Blessings.....Pastorjim