I have the Vital Bow Gear Camelback pendulum sight. It's a nice sight and I like it, but it does shimmy, shake, and rattle, a little bit - even in lock mode.
I have it set for 25 yards, flat level ground. Then I measured it/experimented/tested it out, and I'm dead on accurate from 5 yards to just barely 30 yards, (like maybe 27 +/- ).
Would I buy a pendulum sight again? Well, um, after raving about it last season, and then really studying it against other single pin sights, I would honestly say NO.
Butch A.