For a decade I suffered with a pillowtop mattress that undulated like waves on a sea every time my husband rolled over. Then a month ago I purchased the Memory Foam mattress. It came rolled up in a box and was easy to open and "inflated" almost immediate. We waited a couple days, as advised, before putting it on the bed frame, and the first night I slept like a baby. Even when husband rolls around, I hardly know he's next to me. Now I wonder why I waited so long to get this mattress. My back feels great, and husband likes it, too. It's an all-around winner.