Hi mg517,
Unfortunately the samples wouldn’t give you the information you need. The density of the polyfoam or memory foam and the type and blend of latex is the minimum information that is necessary to assess the quality of the materials in the mattress (see post #4 here).
The firmness of a foam also has little to do with its quality because both lower and higher density foams can be made in a very wide range of firmness levels and you can’t “feel” the quality of a foam.
Phoenix