well i've had good and bad luck with the spitfires. the good thing is that if you get good penatration and a clean pass thru there fine, nice exit wound and good blood trail. but the bad thing is if you hit bone your done they lose penetration and wont bust threw, thats whyI switched to a fixed blade, but you get the same with them also i guess the main thing is you got to get or have a good shot. they do fly true but thats just a way of getting out of fine tuning your bow. wish ya luck