You know... it's a sofa bed thing. I don't know why it was made out of rocks, because this thing feels like a rock when you sit on it (so forget laying down in a relaxing position on it). I think for paying that $500 range, it should be slightly better than what it is. However, it does serve the purpose I need, it's not for me to sleep on so I don't have to know what it's like to sleep on rocks, and it definitely seems heavy duty enough for the use it was made for.