This is my first season with them. I shot a doe with them the first week of season, she ran about 80 yards after the shot and she piled up. The last 5 yards there was no blood, she bled completely out (double lung). Second doe I shot trotted about 50 yards, and layed down. Gave her 45 minutes, went back and that was it. I'm sure a blind guy could follow the blood trails, blood was instantly on ground where deer were standing at the shot. I have shot Muzzys, Wasp Hammer SSTs, Cabelas Lazers, and nothing has given me the blood trails the Spitfires have. They also fly exactly true to my field points. So I would say I am 100 percent happy with 'em. The only problem with them is, can't shoot them thru the netting in the Double Bull blind, and I'm not sure if I would take a hard quartering shot on an animal with them.