Have a Sleep Number king that is a full split with each side having adjustable head and leg heights. I like the bed for comfort, but hate that the bed separates and have to push each half back to the center. If I went back I would have gotten the bed with the independent head/upper body adjustment, but for both lower portion of the bed to have to be raised or lowered together. I like the adjustable aspect because it is much easier on my back. Are there any other higher grade bed mattresses that you would recommend?