I was very hesitant about buying a memory foam mattress and did a lot of internet research. This is the best item I found for the price (high quality foam--5.3lb is top notch--for cheap). Moreover, I liked that I could just use parts of the set as mattress toppers in the case that I would not be satisfied with the set as a whole; (this did not turn out to be the case at all!)The product arrived in about a week (in four separate boxes). Once I got the mattress pieces out of the box, it just took them a matter of hours to inflate to full size. Almost all of the smell went away overnight and once I got it into my bedroom, there was no smell at all.I love this product! I sleep like a baby, and so does my boyfriend. I was becoming increasingly uncomfortable with our spring mattress, especially because we would fall into the center of it; (neither of us is overweight). This mattress is perfect for two people.The instructions suggest putting the 3lb memory foam piece on top of the 5.3lb piece, but i reversed the order to get firmer support. The 5.3lb memory foam conforms to my body just the right amount. I have no back pain WHATEVER position I'm lying in (particularly on my side I feel an improvement), and I no longer wake up feeling sore. Moreover, I am finally able to take midday naps because I fall asleep so quickly on this mattress!My only complaint would be that I have been spoiled. I cannot sleep on my old mattress that has moved to my parents' house!I am recommending this to all my friends. Everyone who has come over and given the mattress a try has loved it.