We ordered 2 mattresses to replace our old and uncomfortable mattresses. Although we have only been using these new mattresses for a week they are both comfortable and supportive. Both my wife and I are seniors and have major back problems. These problems have been lessened and we are now getting a good night's sleep. We also purchased 2 adjustable bed frames from Wayfare and the new mattresses work well with them. Although you can sleep on them after 24 hours I would recommend leaving them for 48 hours before use.