I have killed many deer with head/neck shots. It depends mostly to me on the situation at the time, and most importantly, the distance to the target. I ALWAYS try to get a rest of some sort. If I don't feel comfortable about making that type of shot, I'll put it in the heart/lung cavity. I have killed FAR more deer with chest shots than head/neck shots, but I am not at all adverse to taking that shot if the situation is right at that time.