We got the medium firmness 14" mattress originally, but after several months, could not adjust to it.  The medium felt like a firm.  Contacted Wayfair about the 100 day trial offer and they exchanged for a plush version of the same mattress.  We could tell the difference the first time we used it.  Great mattress overall, but be cautious about firmness ratings.  Thankyou Wayfair for working with us on this one.