I don't like memory foam mattresses - but bought it because my husband was having back problems with our coil one. We selected the "soft" queen sized one and when it came we were amazed at how easy it was to open and let sit for two days - it was actually ready after 24 hours but we waited another day before using it. The smell did not disappear for about a week - but that did not deter us from sleeping on it. So far, after a couple of months, I have no complaints - my husband's back is happier too. We are going to purchase another one for our guest bedroom. We placed it on a European bed frame purchased from Overstock and it is great.