Hi ctting,
I would be very cautious about using anyone else’s experience or recommendations as a reliable indication of what you may feel on the same mattress because a mattress that feels too firm to one person can feel too soft to someone else (and vice versa) and a mattress that is a good match for one person or even a group of people in terms of PPP may be completely unsuitable for someone else to sleep on … even if they have a similar body type or sleeping style (see post #13 here). In the end the only reliable way to know with any certainty whether a mattress is a good match for you would be based on your own personal testing or actual sleeping experience.
Only you can feel what you feel on a mattress and there are too many unknowns, variables, and personal preferences involved for anyone to be able to tell you whether a specific mattress or design will work well for you with any certainty based on specs (either yours or a mattress), health conditions, individual circumstances, or “theory at a distance” (see mattress firmness/comfort levels in post #2 here).
There is also more about the different ways to choose a mattress (either locally or online) that is the most suitable “match” for your specific needs and preferences and how to identify and minimize the risks of making a choice that doesn’t turn out as well as you hoped for that are involved in each of them in post #2 here … and using other people’s experiences as a guideline for your own can be among the most unreliable ways to choose a mattress.
Phoenix