I have used the Grim reaper mechanicals and had great luck. Last year I made a close range shot on a doe and my lower limb hit the stands rail and kicked my arrow off target. It struck hear in the hip and it drove the arrow all the way through the other hip and was sticking out about 4 inches. I was impressed with a great job on a terrible hit. I have harvested three other deer with that particulat head and have had nothing but good success.