Hi Tutrlebed,
I would keep in mind that ILD’s are “comfort specs” and don’t relate to the quality of the materials in a mattress so they aren’t always available from a manufacturer or retailer who may wish to keep them proprietary.
A mattress is only as good as its construction and the quality of the materials inside it regardless of the name of the manufacturer on the label. As you mentioned … they use 100% natural Dunlop and Talalay in their mattresses which are both good quality and durable materials and I would consider any mattress that used these to be a good quality and durable mattress.
I would say they would generally be in a better quality/value range than most mainstream mattresses but I would make some careful value comparisons here (post #13 here has more about assessing the “value” of a mattress purchase) because there may be other similar mattresses available in the area or online that are in lower budget ranges.
A forum search on naturalmattressstore and/or a site search on “natural mattress sto” (you can just click the links) will bring up more comments about them but I would make some careful value comparisons because while their mattresses use good quality materials and have no weak links there are also other similar mattresses that use similar designs and materials that are in lower budget ranges.
Phoenix