i tried a tool to straighten aluminum arrows. it dont work. once aluminum bends it essentially stretches so that arrow will never go back to original form. that arrow will be different from the rest in your quiver. i have carbons from years ago with at least a couple hundred shots on them and they still hit where there supposed to. as far as carbon shatter i think its just people being cheap and that they wont disguard an arrow with questionable wear marks. i have aluminums on my older bows because thats how they were set up. i use carbons today. thats my vote. does anyone remember fiberglass arrows back in the late 70-s?