I waited for a year to write this review as some of the reviewers have stated on other mattress that they wished they had waited as the mattress disappointed them after a few months. I ordered the soft . It expanded to full size within a few hours and no noticable smell. The mattress is firm, does not have any sags,soft spots, or any other defect that has been mentioned by some. There is no jiggle or movement when someone else gets in or out of bed so you are not disturbed. I can sleep on my back(my preferred position) or my side without discomfort. I have lower back pain, but that is relieved by using a pillow under my knees.Not having to turn the mattress is a bonus. Today I orderd a king size 14" select a fimness and another queen size to go into my new condo in Florida that i am moving to next year.I recommend buying a mattress cover to protect it is case of any liquid spills and if you want a softer surface a 4 " topper works well. Just be sure to buy 17" pocket sheets. Overstock sells several thread counts that work well. I went with the 1000 count with bonus pillow cases.