I have back problems (3x herniated disc at L4-L5) and need a somewhat firm mattress. Because of this, I've been skeptical about the memory foam mattresses. I was worried that they would either be too soft or hard as a rock. This one rides the line very nicely. The top few inches is quite soft, but the support underneath is firm. I feel supported but still snuggled in. It arrived in only three days. It was a bit difficult for my husband to get it up our stairs by himself, it's pretty heavy. Once upstairs, we cut away the cardboard and followed the instructions to unwrap it. I laid on it right away to see what it felt like and it was AWFUL! Like lying on a marshmallow. We let it sit while we were away for the weekend (2.5 days) and when we came back it was not only fluffed back up to it's advertised depth, but a full inch more. When I laid on it again, I was so relieved because it was just as advertised with the firm support. We didn't notice any offgassing smell at all, even when we first opened the packaging. We've been sleeping on it for two weeks now and I'm sleeping through the night again instead of waking up every hour with pain. I would imagine that there are better memory foam mattresses out there, but you really can't beat the price on this. I couldn't be happier.