We purchased this mattress 3 year ago, and it was good for the first year but has steadily declined. It does not matter what position we put the bed in, if we rotate the mattress body pain is a thing. We slept in the guest bed to see, and it was definitely this mattress. I regret paying so much for a mattress we are going to have to replace. I am not sure if the foam has broke down, or what the problem is, but this mattress is awfully uncomfortable. My hips and knees hurt, and my back is tight every morning waking up. This mattress was the worst purchase, and the only way to get the cooling benefits is if you do not put a mattress cover on it.