We purchased a memory foam mattress from a local retailer that was almost the death of our happy home. It was hard as a brick! I woke up every morning with a stiff back and hips, as if I had slept on the floor. My husband started sleeping in the guest room to escape what felt like sleeping on a concrete pad. Within a month of our mattress purchase, we seriously considered buying a replacement. After reading reviews on numerous toppers, we took the plunge on this one because of its thickness and positive reviews. The difference is amazing. Paying a little more for the 4" thickness is well worth it. This topper cradles your body like a soft pillow, while providing medium support. It doesn't heat up like some of the cheap foam egg crate toppers either. It's hard to read or watch tv in bed now, because as soon as I lay down, I'm asleep. It's really that comfortable! We now sleep soundly without the feeling of rigormortis every morning.