Hi Cooperman,
The base foams range from 1.5 lbs to 2.35 lbs.
They are all good quality/value in their price range yes (of course higher priced mattresses use higher quality/performance materials) but there are differences between the different models.
They are open and transparent about the base foam they use in each of their mattresses though and the foam density is listed in the description in most cases (and if you call them they will tell you the details of the one you are looking at if it isn’t listed) or if you let me know which model you are looking at I can probably point you to more information or some comments about it as well.
You can see my thoughts about an all latex mattress vs a latex polyfoam hybrid in post #2 here.
Phoenix