Hi bmorgan,
Thanks for taking the time to share the information that they sent you … I appreciate it 
It’s good to see that they are transparent about their materials and the only information that is missing is the thickness of the second and third layers and the thickness and density of the polyfoam base layer.
While the density of the top 1.5" gel memory foam layer is a little lower than I would normally suggest (see the guidelines here) … it’s also only 1.5" thick so it’s in the range of “about an inch or so” of lower quality/density materials so it’s not thick enough to make a significant difference in the durability or useful life of the mattress.
The second and third layers are a high performance polyfoam that are high quality materials and wouldn’t be a weak link in the mattress (see post #3 here).
I completely agree with their comments here. While the quality/density specs of a mattress are the most important factor in the durability and useful life of a mattress … they will tell you very little about how a mattress will feel. You are the only one that can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved to use a formula or for anyone to be able to predict or make a specific suggestion or recommendation about which mattress or combination of materials and components would be the best “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) based on specs (either yours or a mattress) or “theory at a distance” that can possibly be more accurate than your own careful testing or personal sleeping experience (see mattress firmness/comfort levels in post #2 here).
There are also no “standardized” definitions or consensus of opinions for firmness ratings and different manufacturers can rate their mattresses very differently than others so a mattress that one manufacturer rates as being a specific firmness could be rated very differently by another manufacturer. Different people can also have very different perceptions of firmness and softness compared to others as well and a mattress that is firm for one can feel like “medium” for someone else or even “soft” for someone else (or vice versa) depending on their body type, sleeping style, physiology, their frame of reference based on what they are used to, and their individual sensitivity and perceptions. This is all relative and very subjective and is as much an art as a science. There are also different types of firmness and softness that different people may be sensitive to that can affect how they “rate” a mattress as well (see post #15 here).
Once you have the missing pieces of information (the thickness of the two high performance polyfoam layers and the thickness and density of the base layer) then you will be in a better position to compare their mattress to some of the other “simplified choice” or “one choice fits all” mattresses that are discussed in post #3 here.
Phoenix