I always figured that if I had the chance to do a suspension then I would go suicide style, I don't know if it would be possible to do with three hooks or if four would be needed. At first I would definitely just want to hang there and experience the sensation, but would probably want to start doing some swinging around before becoming grounded again.
Well if each hook can support around 70# then I'll be fine with only three since I'm only 165 but might prefer four just to be on the safe side anyways.