First time memory foam mattress buyer. Was a little worried about buying a bed online, but when I researched local stores, prices were 2 to 3 times higher for similar mattress. I did extensive research online to find the best memory foam mattress for the price and this one beat them all. In my research I learned that you need a minimum of 3-inches of density 5 memory foam. This one has 5.3 and the additional 2-inch of 3.3 memory foam is a bonus. I've had the mattress for about a month now and I am very happy with the purchase and this mattress is extremely comfortable....best sleep I've had in a long time. The first night I had to adjust to the firm feeling of the mattress, but it doesn't take long....your body heat allows your body to slowly sink into the memory foam and it is good at cradling your body and supporting it. My previous coil mattresses always gave me back pain throughout the night and in the morning. Now I look forward to going to sleep and sleeping in on weekends. Shipping only took a few days and it came in a huge box....highly recommend 2 people to lift....I was stubborn and excited....adrenaline kicked in and I carried it up 3 flights of stairs myself....not easy. Mattress only took about 6 hours to expand fully. No smell at all, as others have reported. Mattress layers came glued together as one, and not separate layers as others have reported, but that didn't matter. I would buy this mattress again in a second....don't waste your time researching others....I've done all that.