I love this bed. We had a standard mattress with a 3 inch memory foam topper, which was comfortable, but I always woke up with a sore back. I ordered the medium, and it feels very firm to me. The support is incredible, and I'm glad I didn't order the firm. I wonder how the soft might feel, but I'm happy with the medium. It was easily unrolled and looked ready to go with no odor in about 10 minutes. We waited until bedtime, and I woke the next morning realizing I had not tossed and turned and more amazingly, didn't have a backache either. My husband (6' 250 lbs.) slept like the dead, and he has had back surgery. I tend to be a stomach sleeper, but I can sleep on my back or side too. I'm very happy!!