Hey Cougars, I also shoot alum. Just switched back after shooting carbon. I think I've tried them all and they just don't compare. I think most people switch for the speed. As far as I can tell, my arrow gets there about a 1000th of a second after a carbon arrow. An arrow will never beat the speed of sound, so that's why I also like a heavier alum. arrow, its a little quieter at the shot. Good Luck