Waterbeds have the advantage that the spine is always straight, which does not work that way on all other bed types. The waterbed is also very precisely adjustable to the weight of the sleeper. Cold feet belong to the past in bed, as the waterbed is always warm. And do not forget hygiene; you won’t get other bed types as clean as a waterbed (interesting for allergy sufferers). We have been sleeping on a waterbed for 10 years and have been significantly more rested since then (we no longer toss and turn so much), we can only recommend it. The problem is, you really cannot test it, since sleeping on a waterbed once will probably cause back pain (due to the high degree of relaxation of the back). However, anyone who does not want to sleep on something “wobbly” will never like it.