I was super surpised by the quality of this mattress.  No odor what so ever when we opened the box.  The mattress immediately began to inflate when we unrolled it.  This mattress is a bit on the firm side, so if you are wanted something softer, I wouldn't recommend the medium.  My back has felt much better and I am sleeping very soundly.  We have only had this mattress for a couple of weeks, but so far so good.  I read where everyone had to wait on shipping and I was expecting a long wait, but I received my mattress a week after ordering it.