Hi Mujib,
A forum search on Customcomfortmattress or a specific term site search on Custom Comfort (you can just click the links) will bring up all the comments and feedback about them on the forum (along with a few additional results that use the term “custom comfort” but aren’t about that specific manufacturer) but overall they are an old and very experienced manufacturer that make some very high quality mattresses with good materials and construction and are transparent about what is in their mattresses but as you mentioned they are also in a higher budget range than some of the other options that are available to you in the Los Angeles region list so I would make some good “value comparisons” with other similar mattresses.
While price is certainly important of course … the “value” of a mattress purchase is what is most important and price is just one of many factors that can affect the “value” of a mattress purchase. There isn’t a “formula” that can be used to assess or “calculate” the value of a mattress because there are so many different variables and criteria involved that can affect the price of a mattress that can each be more or less important to some people and not to others who may have completely different criteria or definitions of “value”. The “value” of a mattress purchase is also relative to how a mattress compares to the other finalists you are considering or to other mattresses that are available to you in your area (or online if you are also considering online options). There are many reasons that a mattress that may be “good value” for one person or in one area of the country may not be good value for someone else that has very different needs and preferences or that lives in a different area.
There is more about the 3 most important parts of the “value” of a mattress purchase in post #13 here 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 suitability, durability, and all the other parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase if your choice doesn’t turn out as well as you hoped for).
There is also more information and some general guidelines about buying a mattress for children in post #2 here and the posts it links to that should be helpful as well.
Phoenix