Hi PapaMike,
I’m not so sure I would completely agree with this (see the list of top 15 manufacturers here). While a few of their mattresses do use good quality materials (such as some of their Extended Life mattresses) … there are also many of them that don’t so I would be very cautious with King Koil. King Koil is also a licensee brand with different manufacturers that make their mattresses in different areas of the country that can be different from each other so it can also depend on the factory that makes them
I would also be very cautious about brand shopping in general because you are buying a specific mattress not the brand and all manufacturers have access to the same or similar components and materials. The name of the manufacturer on the label won’t tell you anything about whether there are any lower quality materials or weak links in the design that would affect the durability and useful life of the mattress. There is more about the risks of brand shopping in post #5 here and post #12 here. With manufacturers that have a “few” good mattresses and many that aren’t particularly good quality or value I would focus much more on the type and quality/durability of the materials inside a mattress (which are important to know anyway) than I would on the name of the manufacturer on the label.
Phoenix