This Serta, Kendall,  frim mattress which I purchased at Sam's Club for under $200 is wonderful.  After I put it on my bed I put the matress pad, sheets etc., and decided to try it. I could have fallen asleep then, at 1400 hrs.  My dog, George, doesn't like it because he can't wake me in the night to chase the Armadillo off, that is rooting under the bird feeders.Maybe after 2 -3 weeks, I'll have caught up on the last few years of lumpy sagging mattress sleep loss.