I didn't know what to expect but I have a bad back and was waking up every morning with a backache. I decided to try something different and went on to check out the memory foam mattresses. I read the reviews and decided on this one. I was amazed at the size box it came in, and when you opened it up...poof...it grows into a full blown mattrress. I would recommend you opening the box in the bedroom where you are putting it as it does grow fast!!!! The mattress was ready to go in minutes!!! I have to say ever since I have purchased it, I have not woke up with any more pain in the morning. It is so supportive to my back, and yet so very comfortable. My husband was very skeptic about a memory foam mattress, but he has definately changed his mind after sleeping on this one. We ordered the medium firmness. I have recommended it to many.