Hi Princessandthepea08,
While price is certainly one of the more important parts of “value”, 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.
Once you have narrowed down your options to a list of finalists that are all choices between “good and good” and none of them have any lower quality materials or “weak links” in their design and if at this point there are no clear winners between them (which is usually a good indication that you have done some good research) then you are in the fortunate position that any of them would likely be a suitable choice and post #2 here can help you make a final choice based on your own local testing and/or your more detailed phone conversations about each of them, the firmness and suitability of each one, their prices, your preferences for different types of materials and components, designs, or types and blends of foam, the options you have after a purchase to fine tune the mattress or exchange or return the mattress or individual layers and any costs involved, any additional extras that are part of each purchase, and on “informed best judgement” based on all the other objective, subjective, and intangible parts of your personal value equation that are most important to you.
Tempurpedic mattresses use good quality materials but as you know they are in much higher (and mostly unjustifiable) budget ranges and for most people they certainly wouldn’t be in the best “value” range compared to many other smaller manufacturers that use similar (or in some cases better) quality materials that are in much lower budget ranges. You can read more about Tempurpedic in general in posts #1 and #2 here. While Tempurpedic isn’t known for sharing their foam densities, and I don’t have contacts in the UK, John Ryan lists most of the Tempurpedic memory foam in the85 kg/m3 range, which translated to roughly 5.3 lb/ft3, which is similar to many of their mattresses in the USA.
I already provided a brief breakdown of the Hybrid 4 in my earlier reply. It uses multiple layers of a foam they call Laygel, which from what I’ve been able to read seems to be one of the newer breed of higher-density polyurethane foams. One of the advantages of this foam layer may be a less warm sleeping experience. This mattress has a very different construction from the Tempurpedic. Both are foam products, but use very different types of foam in different combinations.
In the end, it comes down to your own careful and personal testing and analysis of the layerings within each mattress (based upon the durability Guidelines I listed earlier), and I would advise you to take the time to wear some comfortable clothes and spend a decent amount of time trying out each product, as this will be the most accurate was for you to determine which product might be best for your particular needs. Selecting which mattress might be best for you via an online correspondence is not something I’d be able to do, as I mentioned again in my earlier reply.
Good luck!
Phoenix