Hi NewtoMemFoam,
One of the most important parts of a mattress purchase is making sure you know the quality of all the foam layers in a mattress so you can identify any weak links and also make more meaningful comparisons to other mattresses (see this article). You can also see some of the foam quality/density guidelines I would use when you are assessing the quality and likely durability of a mattress in post #4 here.
They don’t list the specifics of the foam quality/density in your mattress but if the information here is correct for your mattress then your mattress has 5 layers of convoluted polyfoam (it also doesn’t say the thickness of the layers) of what is probably lower quality/density polyfoam in the upper layers of the mattress. The convoluting would make them softer but even less durable than if the layers were solid. These layers could be a weak link in your mattress and could soften or break down faster than higher quality foams.
Phoenix