Hi Alan B.
There is more about the most important parts of the “value” of a mattress purchase in post #13 here that can help you make more meaningful quality/value comparisons between mattresses.
Unfortunately they don’t provide any information on their site about the quality of the materials in any of their mattresses so I would make sure you can find out the information listed here before purchasing any of them so that you can confirm that there aren’t any lower quality materials or “weak links” in any of their mattresses you are considering.
Without providing this information to their customers it’s not possible for anyone to claim that they are “high quality” mattresses since a mattress is only as good as its construction and the type and quality of the materials and components inside it regardless of the name of the manufacturer on the label.
Phoenix