In what way did 3 blades lack penetration wise?Been around this block many times over the past 30+ years. 3 blades just don't penetrate as well as 2 blades, and a properly sharpened (I file sharpen mine by hand) 2 blade will penetrate like mad and leave plenty of blood on the ground. Quickest kills I get consistently are with a file sharpened 2 blade head. Don't doubt their effectiveness. They work.