Hi brass,
Thanks for the update on your search.
As I mentioned … I would tend to avoid any memory foam mattress that used that much 3 lb memory foam. Convoluted polyfoam will also be less durable than a solid layer.
The information you received from FBM certainly seems “accurate” to me. I think that the biggest issue with them is the uncertainty involved with ordering from them because based on their history what you think you are ordering may not always be what you actually receive so they can be a “risky” purchase. This is particularly true with their latex. You can read more about them in post #2 here and in post #2 here.
Phoenix