This is one very nice mattress! You must be prepared for it to be extra firm!  It shipped in a box, and was pretty heavy.  We opened it up in my room with the adjustable base (purchased separately) ready the mattress expanded rapidly it was amusing to hear the spring coils popping open.  There was no off-gassing or smell. The mattress top is nice and soft, yet the mattress is very firm, which is necessary for my back and shoulders. It works just fine with the adjustable base. It also has the edge support, which means when I sit on the edge of the bed, I don’t slide off - which was a problem with other memory foam mattresses.  It is quite rich looking and surely could match up against much higher priced options.  I think this hybrid style, with coils for support and memory foam for cushioning is the way to go, and at a decent, affordable price.  Go Wayfair! You’ve done it again!!!