Hi dorglet,
While there are many variables involved in the durability and useful life of a mattress … any mattress in that budget range “should” last much longer than 4 years and in general terms I would use the guidelines here to make sure that there are no “weak links” in any mattress you purchase.
A mattress is an important purchase and can have a significant effect on your overall wellbeing and just going back to an old fashioned coil mattress may lead to the same issues even sooner (depending on the quality of the materials in the comfort layers) so I would go slowly and take your time to let the information sink in. In most cases … finding a knowledgeable and experienced manufacturer or retailer that already knows what you would otherwise need to learn, has your best interests at heart, and that sells a range of mattresses that don’t have any weak links in their design, is the simplest way to make the best possible choice.
You are also welcome to post the information about the materials that are inside any mattress you are considering on the forum and I’d be happy to make some comments about it as well.
The process of choosing the “best mattress for you” will come down to …
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Testing for suitability (Posture and alignment, Pressure relief, and Personal preferences).
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Checking for durability (making sure you know quality of the materials in your mattress so you can confirm there are no obvious weak links in terms of durability)
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Comparing for value (based on the parts of your personal value equation that are most important to you).
Phoenix