Let me start off by saying this mattress is comfortable right out of the box. Unroll it, sit down on it, and you'll want to nap. It is perfectly medium.The problem: It lacks structure. Upon unrolling the mattress and watching it expand I flopped on it. I immediately felt my hip hit the frame under the mattress because it compresses easily. And I only weigh 125 lbs. This lack of structure also leads to significant edge compression. I didn't notice significant compression when I slept on it since my weight was more evenly distributed, but you can forget letting your kids jump on this one.And of course, foam sleeps hot. If you run cold or live in Alaska, this might be the mattress for you. If not, or if you are a bigger person, you might want to keep looking.