Replying to Cliff Jumping Danger

There's a place near where I live that is common spot for cliff jumping. The water below is plenty deep and there's hardly any hazards aside from the inherent risks of cliff jumping. The top jump is probably 30-35 ft. My question is: what is the danger in attempting flips off of it? It's not quite high enough to really mess you up because I've seen videos of people slamming and they came out alright. I'm a strong swimmer. Is there any reason for me to fear flipping?