We purchased two of these mattresses for our daughters' new twin beds. They have been using them for a few weeks at this point, and so far we have no complaints.They were not eligible for Prime shipping, so we had to wait longer than usual for the delivery; however, they arrived on the earlier end of the time frame given. The packaging was nice, except one box was opened on one end, but nothing was damaged inside the box.Opening the vacuum packaging was a little tricky, as I wanted to be very careful not to damage the mattresses inside. Once the plastic packaging was cut off, they unrolled and immediately began to expand. They fully expanded to the stated 6 inches before the 24 hours were up (see picture).There was a slight off gassing smell once they were opened, that I would honestly compare to the smell of fresh paint. We kept them in a bedroom with the ceiling fan and a floor fan running, the windows open and the door closed to the rest of the house for the 24 hours recommended to allow full expansion of the mattress. After that period of time, the smell had almost disappeared and was completely gone after a few days (about the same length of time for the paint smell from the new beds to disappear after putting those together). I was VERY concerned about the off gassing smell after reading MANY reviews on this mattress, as well as other brands, and I was pleasantly surprised. It was not bad AT ALL.I personally like that this company stated they do not use fiberglass in their mattresses, which was important to us for our children. I also like that these are made in the USA.I would describe these mattresses as firm, which I believe is stated online, but not uncomfortably firm. We placed a 1/4 inch sheet of plywood on each of the twin beds to provide extra stability to the planks on the bed, as they were a bit too far apart. I'm not sure if this increased the firmness of the mattress or not, as some reviewers described this mattress as too soft; that is definitely not the case for us. The mattress feels firm but still provides the conforming feel you expect with memory foam mattresses. If you are looking for a feeling of sinking into the mattress deeper, I would choose a different mattress. Having said that, these are not uncomfortable at all; they provide a firm, supportive cushion, which is just what we wanted for our children's developing spines. So far, they have maintained their firmness, with only a very slight increase in softness on the top layer, so I'll be interested to see how they are after more use.The 6 inch thickness is great for bunk beds, which is what we needed for when we convert the beds to bunks. One reviewer mentioned that there was an unsafe gap on their child's bed once the mattress fully expanded. I included pictures showing the gap present on ours at the head and foot of the bed. For us, it is minimal and is no more than the gap that exists on our queen size bed with an inner spring pillow top mattress.So far, we are completely satisfied with our purchase. If you are looking for a firm, supportive yet comfortable mattress at an affordable price point, give this mattress a try!