Hiurnmore,
The previous post I linked includes the most important parts of the value of a mattress purchase that can help you make more suitable choices and more meaningful comparisons between your finalists based on the three most important parts of any mattress purchase …
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Testing to make sure that a mattress is a suitable choice for you in terms of PPP (or a more detailed conversation about how suitable the mattress may be for you if you can’t test it in person).
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Checking to make sure you know the quality/density of all the layers that aren’t included in their online description (I believe the layers that they don’t list the density are 1.8 lbs but you need to confirm this to make sure that the mattress has no weak links in the design relative to your weight).
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Comparing the mattress with the other mattresses you are considering based on all the other parts of your personal value equation that are most important to you (including the prices of course along with the options you have after a purchase to exchange or return the mattress just in case your choice doesn’t turn out to be as suitable as you hoped for).
There is also more about the different ways to choose a mattress (locally or online) in post #2 here that can help you identify and minimize the risks involved with each of them.
Phoenix