This is to replace my japanese-style wooden bed (no mattress) I had been using for over a year. I have had back problems from a partial temporary paralysis due to an auto accident 10 years ago. I have tried all sorts of mattresses and even got an inversion table-which is also awesome. But this mattress is like nothing in the world I have ever experienced. You've got to lay in it to beleive it. Stepping on it, you sink to the bottom, but with the entireity of your weight, you are cuddled like an infant in the womb. Meaning every inch is formed to this mattress & there is not one uncomfortable spot. My cat was amazed too, I watched him walk onto it & re-step, then walked across & now he no longer sleeps on the couch while I am at work, it's memory foam all the way for him. My mom tried it too, she was impressed with the structure of all 4 mattresses and the liner, and was in shock at the extreme comfort & price of the product. For the money, I wish I had a bigger apartment to get a larger mattress, but I don't find myself moving all over the place when I sleep anymore. I fall asleep in a comfortable position & wake up in that position. The only thing that does bother me about the mattress is the edges, you cannot sit on the edges, they take all your weight, but if you scoot back and evenly distribute your weight, it is possible to sit without sliding forward. I am crazy in love with this mattress and since I've purchased it have had the best sleep I've could ever dream of experiencing. The manufacturer's website says the warranty is 20 years, so they must really stand behind this product- I know I will try to keep it's integrity for more than 20 years... TOO AWESOME!!!!