Serta Pillowtop Mattress - Firm Review

I was told years ago to get a motionless waterbed for my back pain. Yet, I was still so sore with lower back pain.  Years later we moved, and my waterbed bit the dust, so I went "bed shopping" at "The Brick". The salesperson let me play Princess & the Pea on alot of mattresses and then I landed on the SERTA DEVON FIRM PILLOW MATTRESS. Well that was almost 6 years ago and altho my shoulders tend to hurt a bit still, my lower back pain is GONE. totally gone ! and I awake refreshed ! 1ST I was confused because there's only the padding on one side ? and I am going well I'm supposed to FLIP a mattress? but how ??? then I figured it out .. I REVOLVE the mattress ... I "flip" the mattress AROUND at least once a year but really don't have to. It is HEAVEN to have found such a GOOD SLEEP and the "revolve" theory seems to work great !