Hi FLFisherman,
While nothing has a 100% success rate, many people certainly are more comfortable staying local for a purchase, and careful testing using the guidelines in the tutorial rather than just testing for the more subjective “comfort” of a mattress (which often won’t predict how well you will sleep on a mattress or how it will “feel” when you sleep on it at home) and some good guidance from a knowledgeable and experienced retailer or manufacturer will usually result in a mattress choice that is well inside a suitable comfort/support range and will generally be “close enough” so that if any fine tuning is necessary it would be relatively minor and involve different mattress pads, sheets, mattress protectors, or perhaps even a topper if a mattress is too firm (see post #4 here and post #10 here).
You can read a little more about Paramount (who makes the Nature’s Spa)in post #2 here and the posts it links to. You’d want to know about all of the componentry within any mattress before making a buying decision, and unfortunately Paramount doesn’t normally disclose all the information you would need to know to make sure that there are no lower quality materials or weak links in their mattresses, and Macy’s also doesn’t list those details on their web site.
An all-latex or a latex hybrid sleep system certainly can be a very comfortable/durable option, but you’d need to know about all of the foam layers within the mattress. While it is about online offerings, there is a list of some spring/latex mattress (hybrid) providers in post #2 here.
Phoenix