I have to agree with the post on the Spitfires. These heads performed well on the perfect behind the shoulder shots, but as we all know not every shot is perfect. I hit a deer last year to far forward and the arrow only penetrated about 4 inches on the shoulder shot. After that I switched back to my Muzzys, I have killed 4 deer this year with the same Gold Tip arrow and the same Muzzy head (replaced the blades) and will be in stand tonight with that same arrow and head on the string.I have decided from now on not to buy into the hype on alot of these new products anymore. I' m gonna stick with the old faithfull from now on, they may take a little more work to tune over the expandables but I think its worth the extra time in the long run. If it aint broke dont try to fix it!!!