Im not a real fan about people throwing out the whole Kenetic Energy bs. If you are shooting any compound bow made within saw the last 15 years and shooting more than 40 pounds you can punch a mechanical through one side and either into the other or punture through the other. Kenetic energy is most influenced by speed. so if you shooting 40# or a long bow no dont shoot mechanicals. But idk if these people shooting mechanical are shooting quartering to shots or what by my 2 blade mechanicals will punch through anything atleast once. Also, having a exit hole does nothin to get a quicker kill as all that matters and whats going on in the rib cage. I know my 2 inch hole i put through the first side and through the lungs will knock anything down quick. My bow in a diamond i think 5 or 6 years old pumps more than enough "KE" into an arrow with a mechanical. sorry for the rant lol just my OPINION