I have used one. My friend has one on his RZ4. Its a pain to get up and down but I really think you can jump a little higher. The guy I know got it for barefooting to get out of the water easier.
The only thing it's missing is a spot for your pirate flag. That looks Terrible. I had a friend that made his own Skylon out of re-bar It was like 12' tall with about 6 tie downs to hold it up. This product looks about as good.