I have cervical neck trauma from a car accident in 2007.Was seeing the chiropractor twice a week, until we got this mattress in 2008.
The coils are not up and down, but run side to side, less sagging and more support where you need it most and set up in zones to support different parts of your body more or less depending on expected weight...example my feet are supported less than my back and shoulders. Regardless, 6 years later, still happy, still getting a great nights sleep. some dipping, but less than an inch and to be expected on a super pillow top mattress.
Very Happy.Had Sealy last time, MUCH happier with the Serta!
Reason of review: Good quality.