after a couple of years, it didn't feel as good as it did when i bought it. My sister told me that it's not the mattress that goes bad, it's the box springs. They last 2-3 years on an average. So I got a piece of plywood and put it between the mattress and box springs and presto - good as new! It really is true - give it a try. Less than $20 for a piece of wood or over $1000 for a new mattress.