Heavenly... 
I am 150 pounds and got the 10" Firm memory foam mattress. It sits on 2"x4" slats (which I sanded) about 1-1/2" apart. It decompressed to its full 10" in under 12 hours. I slept on it for 2 weeks before posting this review. I have a bad back and this was the 3'rd mattress I have bought to try and relieve my pain and get some sleep. At first, I thought it sunk in just a tad too much. However, my pain is gone, and I am sleeping like a baby. The firm support is great for sleeping on my stomach or back. It is too firm for side sleeping. When sleeping on my side, I feel pressure points at my hip and shoulder. My 1-1/2" memory foam topper takes care of that whenever I want to sleep on my side. Great purchase. Great price. Quality feel.