This is the first firm mattress I've ever owned that didn't feel like sleeping on a brick. I was worried it was going to be hard to sleep on, but it has been an absolute delight. Its easy to get comfortable, no tossing and turning at night. It sleeps 2 adults and 2 children with ease. It seems to regulate your temperature, so gone are the days of getting too hot when you sleep. When it arrived, I will admit, I was surprised by its height. It's much taller and thicker than our precious mattress and box spring, but it fit perfectly onto our frame. Once we got over the added height, it's been nothing but peaceful sleeping. Hands down, the best mattress we've had to date.