Hi msalerno,
This may be from the firmness of the latex layers (PLB uses some very soft latex in some of their mattresses) or it could also be her thoughts about Talalay latex in general (although it certainly comes in firmer and less “mushy” versions).
There is more about the different ways that one mattress can “match” or “approximate” another one in post #9 here but the mattress shopping tutorial includes a link to a list of the better online memory foam options I’m aware of (in the optional online step) and some of these sell memory foam mattresses that are designed to be close approximations to many of the models in the Tempurpedic line that may be worth considering. Because these types of comparisons can be somewhat subjective in terms of softness/firmness and “feel” (different people will have different opinions about how closely two mattresses approximate each other) … most of them also have good exchange/return policies so that you have good options available if the choice you make doesn’t turn out as well as you hoped for.
There is more about the differences between Dunlop and Talalay latex in post #7 here and more about the differences between memory foam and latex in post #2 here but the best way to “translate” all of this into personal experience or to know which type of mattresses or materials you tend to prefer is by testing a range of different mattresses in different firmness levels with each of them.
Phoenix