I've had 2 slipped disc at L3 and L4 for over 2 years now. Spring beds made my back hurt worse. The first night on the memory foam bed made a huge difference. I like to jiggle my foot while I'm lying there and it used to annoy my boyfriend. But now he doesn't feel the movement. The bed is quite firm, but has a soft solidness to it. It came rolled up in a LONG circular box, and once I opened it, I set it up on the frame and we were able to use it that night. I know it says it needs at least 24 hours to regain full shape, but it didn't seem like it took more than a few minutes. The only thing I wasn't prepared for, no matter how many times I read it, was the amount of heat memory foam beds retain. I'm always hot at night, so I only sleep under a sheet. Even so, I still have woke up several nights drenched in sweat. I also purchased satin sheets that are cooling, but the bed is still very hot. However my boyfriend is always cold, and since getting this bed, he's been comfortable at night. I'm so glad we chose to get this bed. I've gotten great nights sleep every single night. It's ridiculous how much better my back feels, too.