I've had this mattress for a month now and it is perfect. Exactly what I wanted for firmness level. I slept on the firmest side right on the first night and my upper back finally stopped hurting. I do sleep on my stomach most of the night so i needed a mattress that will support mnt back. Then I flipped the mattress to try out the softer side (less firm) and I liked it as well but I did go back to the firmest side few days later because it worked better for me. It really is nice to have the option between the two sides. I'm so happy with my purchase. This mattress is perfect! buy it if you're looking for that true firm mattress.