Bought restonic mattress in 2008. After six months bed started to sag in the middle. woke up with back pain Complained to salesman, received foam to put under mattress. still back pain and sagging in middle. they took my mattress for 9 days for repair. They returned my mattress, its worst. asked repair companywhat they did to it, took off memory foam and put in firm foam. I told her the problem was a sinking middle. She replied" there's nothing we can do about that." Don't buy this mattress. You'll be sorry u did. I know I am. read full review »