Hi MrM1,
Higher quality more durable materials cost more but that has nothing to do with “comfort” or PPP (Posture and alignment, Pressure relief, or Personal preferences). The very lowest quality materials (that may only last a few months) and the highest quality materials (that can last many years) can feel great or even the same when they are new if the design of a mattress is a good match for you … it’s just that lower quality materials don’t last as long as higher quality materials. When you are looking at mattresses that are made by a good manufacturer then all their mattresses would have a similar margin (although higher budget ranges do tend to have slightly higher margins) so from a “cost of material” point of view any of their mattresses would be in a similar “value” range.
The real question is would the additional cost be “worth it” for you and post #16 here has more information about how they compare that may help you decide.
The Brooklyn Bedding exchange and return policy is here.
The Dreamfoam return policy (for mattresses purchased from the Dreamfoam site only) is at the bottom right corner here.
The cost of the Dreamfoam layer exchange policy as far as I know for their mattresses that have a layer exchange option is in post #7 here. I believe it is for 120 days (you can hover your mouse over the exchangeable comfort link on the same page as their return policy) but I would always check with them to make sure.
Phoenix