Hi Janny,
I don’t know what IWC stands for either (except the last “C” probably stand for “coil” and the first “I” may stand for independent but these are just guesses)
If the specs are correct then 5.25 lb memory foam is a high quality material and the 1.8 lb polyfoam (which as you mentioned would likely be between the coils and the memory foam) is also a good quality material. My biggest concern would be the 1.5" of comfort foam (which will soften) in combination with the fibers (which will compress). Together these top layers are more than 2" and would be more than I would be completely comfortable with but they are also thinner than the lower quality materials in most mainstream mattresses made by the major brands. The pocket coils are good quality but the coils in a mattress are not normally the weak link of a mattress.
The warranty of course means little and is about marketing more than anything else because it doesn’t cover foam softening or the loss of comfort and support and has nothing to do with the useful life of a mattress (see post #174 here about warranties).
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The Zenbody is mostly synthetic Dunlop latex which is a lower cost version of latex but is still a high quality material. You can read more about it in this thread.
Some of the better options I’m aware of in your area are listed in post #8 here.
If it’s new and not a floor model and if it matches the criteria of your personal value equation and is suitable for your body type and sleeping positions then from a materials point of view I think would be good value yes (assuming it’s queen size or larger) but I would make sure that you know the specifics of the layering (or at least check the law tag to make sure there isn’t anything else except latex) to make sure it’s the same mattress as the earlier thread was referring to.
Hope this helps.
Phoenix
PS: I just figured out what IWC means with some google searching … it’s “individually wrapped coils”