Ive been shooting Aluminums since I started bow hunting and have had very few ever fail me. Since I Switched to aluminum2314's I have have never had one fail me. Im shooting right around 60lbs, every shot taken on a deer has been a clean passthrough, most of my shots are anywhere between 20-25 yards. Blood trails were excellent, of course most of my kills I give credit to Muzzy for. My cousin has been shooting carbon/aluminum for years, although hes been pretty successful, he has a hard time finding his deer because the lack of blood. Not sure if its his Thunderheads or hes shooting too fast, hes using amedium diameter arrow, with a 100gr thunderhead. Im not a speed freak by any means. Speed is not what kills, but it does have a small factor in the kill. I compare arrows to bullets, the lighter the bullet, the faster its going to travel, the faster it may pass through the deer causing less damage, the heavier the bullet, the slower its going to reach its mark but when it hits, more damage is made. this of course depends on shot placement as in with an arrow. The only reason I am going to carbons is because the price of steel is getting too high to keep replacing aluminum arrows. Not because they dont do what they should because they do, and they do it damned well in my book.