This topper makes a nice difference if you have a mattress that is a little too firm and you don't want too much extra height on an already high mattress (ours is 16"). I wouldn't recommend this size if your mattress is very firm; in that case I would recommend a 3". I was pleasantly surprised to see that it is a Serta product. Description on Overstock doesn't mention that. Absolutely follow the enclosed directions. I turned the heat up in our bedroom to speed up the decompression of the pad. Let it unroll on its own and then very gently unfold. Mine had no odor at all. I have purchased several memory foam toppers over the years and have always been disappointed that they never measure the same as the mattress. We have a queen bed and solved that by ordering the king topper and just trimming one side off to fit perfectly. Shipping was very quick as usual with Overstock.