I purchased this mattress because it had a good rating and most of the reviews were positive. However.....I kept my new mattress out to expand for three days, hoping that the long indentation, two thirds down on one side, would disappear as the mattress expanded. After three days the mattress still had this indentation, causing this area to expand to only 4.5 inches. Even in the thickest spot, it’s only 9.5 inches. (See photos) Definitely won’t be keeping it!