Hi asjdwf,
This is one of the most common questions on the forum and there is some fairly extensive general information in the mattresses section of the site that can give you some general guidelines and insights but this is not specific to any particular person and may be more complex than you really need to know.
There are far too many variables and unknowns (body types, sleeping styles, preferences, physiology, age, health conditions, sensitivities, special circumstances etc) to use any formula or “theory at a distance” or any other person’s experience to choose a suitable mattress that can possibly be more accurate than your own personal testing on similar mattresses with similar designs and materials that you can use as a pointer or approximation. If this is not possible … then the next best way is more detailed discussions with an online manufacturer or retailer themselves. They are much more familiar with their own mattress designs than anyone else (including me) and can give you ideas based on the “averages” of other customers that may be similar to you in their body type, sleeping style, or personal preferences and circumstances which can be a very useful guideline as long as you are inside the “averages”. Of course the options available with each design and your ability to exchange layers or the mattress itself or use other forms of fine tuning may also be an important part of your personal value equation.
So I’m always happy to help the members here with “how” to choose or to connect with better manufacturers or retailers but “what” to choose in terms of either a mattress or the balance between comfort/pressure relief and support/alignment is always up to the only person who can feel what you feel on a mattress and best left to personal testing and your own experiences or more detailed discussions with the more knowledgeable people at the retailers or manufacturers that sell the mattresses.
Like many other mattress questions … this is also not as simple a question as it may seem because like most mattress questions the answer includes “it depends” in the answer. You can see the different factors that are part of durability in post #4 here and the posts it links to.
As you will read … the upper layers of a mattress are usually its weak link in terms of durability and in these layers it uses medium and high quality memory foam or gel memory foam that are roughly equivalent to the Tempurpedic Cloud series that use 4 and 5 lb memory foam as well. The base layer is 1.5 lb polyfoam which is a lower to medium quality/density but this is not usually the weak link of a mattress. Overall … it uses higher quality materials than most mattresses in this price range in the layers that are most important for durability and “feel” and has much better quality and value.
They have also said that it is very similar to the Tempurpedic Cloud Luxe except a little firmer and because softness is also a durability issue and because you are a little higher weight this may also have an effect. It would also be a very good idea to test the Cloud Luxe locally to make sure that it was suitable for you in terms of PPP (Pressure relief, Posture and alignment, and Personal preferences) because it is a softer memory foam mattress which can sometimes present some risk for alignment for higher weights and you are on the borderline where I would be a little cautious and make sure your testing indicated that it was suitable for your needs and preferences.
Phoenix