Hi paddyb,
I’m not sure which specific brands you are referring to but I would also be very cautious about brand shopping in general because you are buying a specific mattress not the brand and most manufacturers have access to the same or similar components and materials. Many manufacturers make a wide range of mattresses that can vary from lower quality and less durable materials to higher quality and more durable materials in a wide range of prices. The name of the manufacturer on the label or the price of the mattress won’t tell you anything about whether a specific mattress is suitable 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 (which are the two most important parts of a mattress purchase). There is more about the risks of brand shopping in post #5 here and post #12 here.
In other words … outside of your own careful testing (hopefully using the testing guidelines in the tutorial) or your own personal experience to make sure that a mattress is suitable for you … I would focus more on the quality and durability of the materials inside it than on the name of the manufacturer on the label.
I would be very cautious about buying any mattress that uses lower quality/density materials or where you aren’t able to find out the quality and durability of the materials inside it. There would be little value in buying a mattress that only maintained the comfort and support that was the reason you purchased it in the first place for only a few years (or in some cases much less) regardless of the price of the mattress. I would always keep in mind that how a mattress “feels” (which is the reason for the trial period) and the quality and durability of the materials (which you can’t “feel”) are completely separate issues.
I would also make sure you have read my reply here so that you have the best possible chance of making a successful purchase in terms of suitability, durability, and value.
Phoenix