We purchased this mattress for our guest room in king size.  Arrived quickly, opened box and took mattress out…..it’s heavy and you need two adults to do this.  We cut away the heavy duty plastic wrap….be careful not to cut the mattress….and the mattress sprang out and within seconds the mattress was on the bed frame.  No smells.  We left mattress alone for a few days and then I made the bed.  No issues so far and it’s been a good five weeks or so.  Three family members have visited and all found it to be medium to firm and comfortable.