I've used these broadheads for the past 2 years. I've shot and killed 3 deer with them. I've had decent blood trails and huge entrance and exit holes. All three deer taken w/ these have not ran farther then 40 yards. All the tips have slightly curled after shooting deer (even on complete pass-throughs), but I dont re-use them so thats not really an issue for me.
Overall, I find them to be a high quality mech. broadhead.