ORIGINAL: Grasshopper13
I bought a tru glo pendulum sight this year. I've always been terrible at judging yardage. It will do what it says. You sight it in at 20 yards and it will swing free and adjust the sight for you out to 35 yards with my setup. The thing that sold me was shooting a 3# biologic clover bag at 2 yards under my stand. I could repeatedly drill the deer pictured on the front of it no matter where I placed it. They work!
GH
They do work,however mine tended to overcompensate and shoot low, the sight would swing out oo far. I waqs able to remedy the situatuin with some tape. The other problem w/ the Tru-Glo that I had it seemed loose and would rattle a little on the shot making it noisy. I went back to a fixed pin sight.