This was our first mattress in a box, and I was a bit nervous about it because it was a King size and I was hoping it would not puff up uneven. Well, I was pleasantly surprised when we received it, set it up on the mullican bed, also from Wayfair, and the mattress reached its total height in minutes! It is super comfy, perfectly even, and the edge support is great. This new thing will definitely do away with old fashion mattresses. I am very happy with my purchase. FedEx lost my package in transit for one day but that's another story.