I did a lot of research and cross-compared about 20 different products at least before choosing this one as being the best for cost for quality. There was no odor, it was not overly heavy and it arrived quickly. This is for the guest room so although I prefer soft I picked this as a medium firmness. I tested it out and I am tempted to get another for my room. The difference in how my back felt in the morning was great. I wear a fit bit watch that tracks my sleep and I can see how often I would wake up. The first few nights sleeping on this pad my sleep tracking showed that my time waking up was cut nearly in half. I also stay in deep sleep longer. I was only getting up 34 minutes a night in the deep sleep stage now I am hitting the normal range of deep sleep at about 1.5 hours a night. I am very happy with this mattress topper.