If it's not broke,why fix it?I've killed over 30 deer in the last 4 years using NAP Spitfires and Shockwaves,90% have been total passthoughs.Actually,I'm disappointed when I don't get a passthough.Of course,shot placement is key,and I don't take "risky"shots.The NAP products have never failed to perform,and I keep my side of the bargain up by keeping my eqiupment in tune,making good clean shots,and driving a 413gr.arrow at 282fps...Bob