I had one in college and to answer your question... NO!
The worst thing about it was in the missionary position each time you thrust downward the mattress sunk in the bounced back up. Didn't know if I was coming or going. Rolled off of it a couple of times too.
Best thing about a water bed though when you're single is that if a chick has not done it on a water bed then the curiosity factor takes over. In other words I think if you're trying for multiple scores then go for it.
Oh yea, if the heater doesn't work then you will freeze your ass and nuts off.
