So far, so good!  We've only had the mattress for about a week, and we purchased the "firm" option.  After searching for a firm memory foam mattress, because I suffer from back pain, this mattress seems to work so far!  My husband weighs substantially more than I do, and other mattresses hold up for a bit, then start to sag because he's heavier, so we decided to get two twin XL mattresses, and I'm hoping that my side stays firm for my back issues!  Love it so far!