I am not sure why I am even responding to this. Here it goes, just do the math like you said. Its been scientifically proven to work already. 5 years in the making. You don't have to buy it...obviously, but you are incorrect in your response. Think force. Essentially what your implying is if I shoot a target with an arrow lets say it penetrates 8 inches. Now with the slide hammer your also implying it will penetrate 8 inches. You have to take into account how force works. The slide hammer will penetrate much further every single time if you have your testing set up correctly because penetration measurement is very variable. Its already been shown hundreds of times to many researchers and hunters alike. You have no idea what this does to bone because you have not used it, so I suggest researching more into it before you falsify a product. An opinon is much different, but from what you wrote your falsifying a product proven to work. Of course many people will be leary on the product much like when carbon arrows first came out, that is understandable, however, carbon arrows are now very popular now. You will see by next year how this product will revolutionize the arrow industry. Arrow manufacturers can now make lighter arrows without sacraficing kinetic energy by using this product. Again it has already been proven to major manufacturers all of which made offers on partnerships and to purchase this product. More importantly this device also provides secondary impact and arrow flight stabailization two key points you missed sir which I should have included in my initial post, I apologize. It is very far from a "gimmick" that was pretty rude of you to say.