We're very happy with this mattress! After quite a bit of research on the big brands we found all the features in this mattress at a much more reasonable price. After all, foam is made up of polyols, isocyanites and surfactants. Chemically there's little difference between this foam and that of the big names. It's all marketing hype. Just watch for the densities of the layers and make sure you select the density that best matches your mattress preferences - higher density = firmer mattress.And the most important point I want to make is that we get a better night's sleep and wake up without backpain. Our conventional mattress was less than a year old and cost nearly twice as much. We hated it. Obviously we're very happy to have replaced it with this mattress. The difference is that big.Thanks Overstock for offering memory foam mattresses at a fair price without all the marketing-induced mark-ups.