I used G5 montecs this year and shot a 10 point whitetail. I was not impressed with the blood trail. I double lunged it but missed the heart. The deer ran about 250 yards zig zagging before dropping. The blood trail was almost non-existant. The blades should have been sharp as I had not shot them even into a target. (I tuned using the target practice version).
I have heard too many horror stories with mechanicals. I don't think I can trust them. I want a clean quick kill so at this point I am not sure if I will stay with the montecs or find another fixed blade to shoot.