Hi pooter03,
I would be very cautious about brand shopping 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 also won’t tell you anything about whether a specific mattress would be a suitable choice for you in terms of PPP or 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. Outside of making sure that a mattress is a good match for you in terms of PPP (or that you have good options after a purchase if it isn’t or if you aren’t sure) … in terms of assessing the quality and durability of a mattress I would focus much more on the design of the mattress and the type and quality/durability of the materials inside a mattress than I would on the name of the manufacturer on the label (see the quality/durability guidelines in post #4 here)
I don’t think there is much I can add to Jeff’s very helpful comments and as he mentioned the King Koil Extended Life mattress uses high quality materials and components and unlike many of the other King Koil mattresses … there are no weak links in the mattress in terms of durability. “In theory” it would be a suitable choice for many stomach sleepers but I would keep in mind that the only way to know whether any mattress is a good “match” for you in terms of PPP with any certainty will be based on your own careful testing or personal experience.
Phoenix