Hi Scrappy70,
Outside of an actual defect in the materials that would be unlikely because of the quality and durability of the materials they use. I would also keep in mind that their current Serenity latex mattress hasn’t even been available for 2 years yet.
I certainly wouldn’t just “hope for the best” and I would use the guidelines in post #13 here to help you make more meaningful comparisons between mattresses based on your confidence that a mattress will be a good match for you in terms of PPP, the quality and durability of the materials inside it, and on all the other parts of your personal value equation that are most important to you.
When you are down to finalists that are all choices between “good and good” and none of them have any lower quality materials or “weak links” in their design and if there are no clear winners between them then you are in the fortunate position that any of them would likely be a suitable choice and post #2 here can help you make a final choice based on your local testing or mattresses you have slept well on, your more detailed conversations with each of them, your confidence about PPP and the suitability of each one, their prices, your preferences, the options you have after a purchase to fine tune the mattress or exchange or return the mattress or individual layers, any additional extras that are part of each purchase, and on “informed best judgement” based on all the other objective, subjective, and intangible parts of your personal value equation that are most important to you.
Phoenix