My partner and I couldn't afford a TempurPedic right now so we opted to try a king size Serta. The mattress was easy to unpack and came to full thickness in a few hours. The smell lasted about a week for us but dissipated after. We are both big guys and the mattress is surprisingly supportive in all sleeping positions. We have it on a box spring, as we feared it would lack the support we need on a platform. My partner has been getting the best sleep of his life after giving up his coil mattress. I sleep well but am adjusting from my Tempur. We will upgrade at some point, but it's an excellent and comfortable mattress, and a great bargain.