I have a Queen size Sealy Posterpedic mattress that I have had for a few years now. The matress is still comfortable but it sags in the middle. When my wife and I are in the bed together, we both slide towards the middle of the bed and it is like rolling down hill. I don't know if I just got a fluke but for what this mattress cost, I expected it to hold its form a lot longer. I have had cheaper mattresses that lasted longer. However, when I first got it, I got the gbest night sleep I ever had in my own bed.