Without a doubt, these are the classiest of all beds. Having a waterbed shows that you are comfortable in your sexuality and your classiness.
It tells people that you are comfortable on the water and that you might own a boat or at least spent a significant amount of time in the important part of a boat. Because if you had worked in the crappy part, why would you want to recreate it every night?
Waterbeds provide all the fun of sleeping in a boat (motion, the potential for leaks) and all of the erotic delights of privacy.
They are also expensive.