In the begining I was anti mechanical.... Totally a Muzzy man cause the first one's out were not the ones of today. I kept an open mind and after reading 5Shots reviews on several and especially the Rocky Mountain Snyper I decided to give them a try. I've shot 3 deer with the Snypers and have been thoroughly impressed with them. Like was mentioned above, the entrance hole is huge because of the design of the blades opening and the exit hole is excellent. The durability of the blades lack in my opinion but it doesn't matter, the damage to the deer is done and you should change the blades anyway. Excellent holes, great blood trails and short recovery on all 3 deer.