We bought three of these mattresses and without any hesitation we recommend them.  Our first purchase was for our primary bedroom, 14” king.  Because we were moving to a new home we opened the mattress in the morning and slept on it that night.  No smells and no issues with using it after 10 hours of unboxing.  It is semi-firm so I later purchased a gel topper for just a little softer feel.  After we tested out our mattress we purchased two more for our guest rooms, both king and 12” tall.  Again, no issues!  No box springs needed.  Purchased three metal platform frames.  Very happy!  Great value!  Easy!