I use a leupold rx-600. Trouble I've had is it doesn't like a lot of brush or mesh blind windows, and can't range deer out to the distance they say is possible, which I believe is at 350-400 yards (could just be me not holding exactly on the deer tho). Will range trees at that distance, but not much past it for me, which I believe they say it will range trees to 600 yards. But for a typical bow hunting situation, I make it work for me. Have heard a lot of good about the Nikons tho.