Hi equipped,
Yes … I think highly of them and the Berkeley Ergonomics mattresses that they sell.
It’s not a common design but it’s also not uncommon to have two or more layers of coils in a mattress either. Microcoils are a very breathable and durable component in a mattress (see this article and post #10 here) and they certainly wouldn’t be a weak link in a mattress that used them.
You can see the specs of the PLB Worlds Best Bed in post #2 here. It uses blended Talalay latex from top to bottom but this is also their softest mattress so I would be cautious and make sure you do some very careful testing for PPP (Posture and alignment, Pressure relief, and Personal preferences) with both of you on the mattress and using the testing guidelines in the tutorial post because this mattress could easily be too soft for many people … particularly if they don’t sleep on their side or are in a heavier weight range. While Talalay latex is also a very durable material … softer versions of any material will also be less durable than firmer versions.
This is blended Talalay latex that has phase change gel added to the formula. There is more about what Latex International calls Talalay GL fast response (and PLB calls Active Fusion) in post #5 here and post #2 here.
While I don’t make specific recommendations for stores or mattresses because there are too many unknowns, variables, and personal preferences involved in a mattress choice for anyone to know which mattress would be best for someone else (see mattress firmness/comfort levels in post #2 here) … the better options and possibilities I’m aware of in the Sacramento area (subject to the guidelines here) are listed in post #5 here.
Phoenix