Tempurpedic Rhapsody Mattress Review

I have always loved the tempur pedic beds and finally decided to purchase one after having a failed back surgery and chronic pain syndrome. I tried all the beds at the store and the sales man told me this one was the best and they had a sign stating that this one was the one that Oprah endorses-I remember too because I saw the exact show she did on it and some other favorite things of hers. So, if Oprah has this bed I figured it must be a good bed, plus it was a good middle of the road bed..not the bottom of the line and not the top of the line that was totally out of my price range. I laid on it and it seemed pretty comfy but not as squishy as the deluxe or classic. I was told that when I get mine home to lay on it-even walk on it barefoot to help break it in and soften it up and in a month or so I should have a good idea of how it will feel. I was promised by the sales guy that I would not want to return this bed. I should have trusted my gut-it's been not quite 2.5 months and the bed is still not squishy like the deluxe model was. The Rhapsody has the tempur-HD in it that makes it much more firm than the others..great if you want comfort with more firmness. I'm sure mine will continue to soften up even more as time goes by but i'm thinking about just trading mine in for the Deluxe model and saving myself 600$...It seems to me the only real difference between the two is:  2 inches of firmness/height and a suede matress cover-that gets covered with your sheets anyway. All the salespeople have told me this is the most popular bed sold..but judging by the reviews I'm starting to think maybe they lied.