Hi eggbed,
The description that you linked to doesn’t include the quality/density of the foam layers in the mattress and without this it’s not possible to make any meaningful comments about the mattress or identify any possible weak links in its design. The information you need to assess the quality of a mattress and make meaningful comparisons to other mattresses is in this article and once you have this information you can compare it to the guidelines here.
If you can find out and post the information I would need I’d be happy to make some comments about the mattress and the quality/durability of the materials inside it.
You can evaluate a mattress for quality/durability based on specs but there are too many unknowns, variables, and personal preferences involved to know how well a mattress matches your your specific needs and preferences in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) based on specs (either yours or a mattress) or on “theory at a distance”. The only way to assess the suitability of a mattress would be careful and objective testing using the testing guidelines in the tutorial post or when you can’t test a mattress in person then a more detailed conversation with a knowledgeable and experienced online retailer or manufacturer (see mattress firmness/comfort levels in post #2 here).
If you aren’t confident that a mattress will be a good match for you then the return or exchange policies of the business you are dealing with would also become a more important part of your personal value equation just in case your actual sleeping experience indicates that the mattress isn’t as good a match for you as you and the online retailer/manufacturer hoped for.
A forum search on Summerfield (you can just click the link) will also bring up more information and feedback about them.
Phoenix