I am so pleased with this purchase. I needed a new mattress since I have lower back problems and researched somewhere that memory foam was the way to go. I found this mattress on sale and bought it off of Groupon and am so satisfied with my purchase. Fast shipping for my new mattress, easy and fast set up and the memory foam stays in place. I have had this mattress for over 2 years now and have no issues with it wearing down, or getting to lumpy or used in spots. This is the best purchase I have made in a while and I am so happy the meaty teas is comfortable and not too soft and not to hard. No need for a box spring but you could use one with it- I use it on a bed that doesn't have one and there are no issues. I would definitely recommend to others.