This is an excellent mattress. I first saw it in a discount store and made my mind up to buy it there and then. At the last minute it occurred to me to just compare prices with Amazon, which I did. It was £70 cheaper! Delivery was in good time as I was given a month's free trial on Prime. It came boxed and therefore a manageable size (beware, once opened it ain't going back in there!) to move around. It said on the box that it would take 24 hours to fully restore itself to its actual size, however I think it was a lot shorter than that and was usable virtually straight away. I have found that fitted sheets suit this type of mattress better than a normal sheet. I have found it very comfortable, but this is compared to my old mattress, which would have to be carbon dated to establish its age! No complaints at all, good product, good price, good service; what more could I ask for?
nb: check the box beforehand to make sure your bed is compatible, there are certain requirements that hadn't occurred to me to think about when buying the mattress. Fortunately I was able to verify that my bed was suitable i.e. width of slats, gaps between slats etc.