So far so good.  I ordered this one after another brand did not expand properly.  This expanded almost fully right out of the plastic.  No odor.  The mattress was a little more plush than the other brand's "medium" mattress, but I am not mad about it.  It is still comfy.  It does seem to weigh more than others.  I couldn't move the box myself.  Over all, I'm happy with the purchase and am considering replacing another mattress with this same brand.