I have shot quite a few rabbits with a blunts, and even more squerrils, i have always been dissapointed.  i once shot a squerril in the chest with a judo as it was standing facing me.  it took the arrow up the tree.  20 min and a lot of arows later i knocked him down, with my judo still stuck in the white of his chest.  no way i was getting him.  broadheads do let them run sometimes, but they always die, and if i can make out the trail they are mine.  i lost faith in blunts on squerrils.  i always shoot for the chest, and have hit it enough with a 60 lb recurve to say i am dissapointed with the results.  i agree that blunts so a great job on head shots, but i am not good enough to always hit the head.  i prefer a large cutting surface that allows me to make some midtakes.   most rabbits i have hit with broadheads have died on the spot --just my opinion.