Hi tgrafix,
One of the most important parts of a successful mattress purchase is to make sure you know the specifics of what is inside any mattress you are considering. The information you would need to identify any weak links or make more meaningful comparisons is in post #4 here.
Once you have this information then along with the results of your own personal testing and making sure you have the information you need about the other parts of your personal value equation that are important to you then you would be in a much better position to compare the “value” of one mattress purchase with another.
You will find there is a very wide range of prices, options, and designs for mattresses that use similar materials and components and one may also be a much better match for you in terms of PPP than another as well.
Phoenix