Well I have nothing bad to say about these heads (100 grain 2 blade- 2" cut) I broadhead tuned with fixed blades, and went with a mechicanical to try them out. Ive taken two deer at about 15-20 yards with them. Both werent the greatest shots unfortunately. But both deer had massive blood loss and didnt make it 40 yards away. I cant think of anything but a really bad shot would cause you to loose a deer with these. Now that being said in my eyes they arnt that re-useable. Ive dammaged some from hitting those animals, also some from pass through- ground contact, and I need more o-rings. My only fear is one will open in flight (may have happened already?) And the blades on mine chatter a little while holding the bow.