Did 16 hours of research online before purchasing this mattress.  We purchased the 10" Serenity hybrid for our guest room.  Our granddaughter LOVES this mattress. She reports it is the best mattress she has ever slept on (she is adult size).  It came in a small but heavy box.  If you have not purchased a compressed mattress before, be careful when opening it.  You don't want to accidentally cut it when opening and once the thing burst out of the box, it knocked me flat.  Got a good laugh out of it. We are really happy with the quality of this mattress, the price, and happy with the Novilla company and will buy from them again.