Hi npolite,
Hopefully you’ve already read the mattress shopping tutorial here which includes all the basic information, steps, and guidelines that can help you make the best possible choice … and perhaps most importantly know how and why to avoid the worst ones.
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort” and PPP that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists (based on all the parts of your personal value equation that are most important to you).
While I can’t speak to how any mattress will “feel” for someone else because this is too subjective and relative to different body types, sleeping positions, and individual preferences, sensitivities, and circumstances … outside of PPP the most important part of the value of a mattress purchase is durability which is all about how long you will sleep well on a mattress. This is the part of your research that you can’t see or “feel” and assessing the quality/durability and useful life of a mattress depends on knowing the specifics of its construction and the type and quality of the materials inside it regardless of the name of the manufacturer on the label (or how a mattress feels in a showroom or when it is relatively new) so I would always make sure that you find out information listed here so you can compare the materials and components to the quality/durability guidelines here to make sure there are no lower quality materials or weak links in a mattress that would be a cause for concern relative to the durability and useful life of a mattress before making any purchase.
I would be very cautious about all of the mattresses you listed because I believe that all of them use more than “about an inch or so” of lower quality or unknown materials that could be a weak link in the mattress and would be a cause for some concern in terms of the durability and useful life of the mattress.
Having said that … if you can find out and confirm the density of all the foam layers in the mattresses you are considering and post them on the forum then I’d be able to make more meaningful comments about the quality/density and durability of the layers and the mattress as a whole and let you know if there are any lower quality materials that would be a cause for concern. Without this information it’s not possible to make any meaningful comments about the quality or durability of the materials in a mattress and you would be making a very risky choice.
Any mattress with a polyfoam support core will generally do best with a firm, flat, and evenly supportive support surface underneath it that has minimal to no flex under the mattress and for larger sizes with at least one center support beam that has good support to the floor to prevent any sagging in the middle of the mattress. The components (bedframe and foundation or platform bed) need to be strong and durable enough to support the weight of the mattress and the people sleeping on it without some of the parts bending, sagging, shifting, or breaking with extended use. The support surface under the mattress (which may be slats or a steel grid) should have enough surface area to prevent the mattress from sagging through any gaps or spaces in the support surface over time but still allow some airflow under the mattress. If a foundation has a slatted surface then I would suggest that the gaps between any slats are no more than about 5" (with 1 x 3 slats) although less than 4" would be better yet.
I’m not sure of the thickness of the slats in the platform bedframe you linked or the distance between the slats but if they are relatively thin and flexible (which I suspect they are) then it may be worth replacing the slats with thicker ones that have less flex.
You can see my comments about the Consumer Reports mattress ratings and recommendations in post #2 here and in this topic. While they may be a good source of information about more “objective” purchases … as you can see I would consider them to be an unreliable source of information or guidance about purchasing a mattress and they are somewhat nonsensical and meaningless. My thoughts are also shared by most of the more knowledgeable people in the industry (see post #5 here for an example).
While other people’s comments about the knowledge and service of a particular business can certainly be very helpful … I would always keep in mind that you are the only one that can feel what you feel on a mattress and I would be cautious about about using other people’s experiences or reviews on a mattress (either positive or negative) or review sites in general as a reliable source of information or guidance about how you will feel on the same mattress or how suitable or how durable a mattress may be for you and in many if not most cases they can be more misleading than helpful because most consumers have little knowledge about mattresses and mattress materials or how to assess the quality and durability of the materials in a mattress and any mattress that would be a perfect choice for one person or even a larger group of people may be completely unsuitable for someone else to sleep on (even if they are in a similar weight range). In other words … reviews in general certainly won’t tell you much if anything about the suitability, quality, durability, or “value” of a mattress for any particular person (see post #13 here).
You can see some general comments about what I call “simplified choice mattresses” in general in post #1 here and you can see some more specific comments about the Leesa mattress along with many of the other “simplified choice” online mattresses in post #2 here in the same topic. A forum search on “Leesa” (you can just click the link) will also bring up many more posts with comments and feedback about it as well.
I would be cautious here because the 2" of 3 lb memory foam in the Leesa is a lower quality/density material than the minimums I would generally suggest in the guidelines here and I would consider it to be a potential weak link in the mattress (although the 2" of Avena polyfoam above the memory foam would improve the durability of the memory foam somewhat compared to having the same lower density memory foam in the top layer of the mattress).
While it’s not possible to quantify the sleeping temperature of a mattress for any particular person with any real accuracy because there are so many variables involved including the type of mattress protector and the sheets and bedding that you use (which in many cases can have just as significant an effect on temperature as the type of foam in a mattress) and on where you are in the “oven to iceberg” range and because there is no standardized testing for temperature regulation with different combinations of materials … there is more about the many variables that can affect the sleeping temperature of a mattress or sleeping system in post #2 here that can help you choose the types of materials and components that are most likely to keep you in a comfortable temperature range.
Outside of the list of the simplified choice mattresses … the mattress shopping tutorial also includes several other links to lists of many of the better online options I’m aware of (in the optional online step) that include many different types and categories of mattresses in a wide range of budgets, firmness levels, and with different return/exchange policies that may also be well worth considering.
Phoenix