I read the reviews and figured this mattress was worth a try. I have waked every morning for the last 18 years with lower back pain. My last mattress cost $1,600 and did not help my back. This mattress showed up on a Friday and I placed it on my Queen box spring Saturday. It expanded rather quickly, however the ends at the headboard did not fully expand. It was a little wider (3 inches) than the box spring. The "Bonus Pillows" are a total joke. I've had pieces of gum bigger than them, but they will work well as knee pads while doing yard work. It is taking me a little while to get used to this type of mattress, but I love it. I have not had any morning back pain since I started sleeping on this. It is amazing..