Hi db729,
In most cases the base foam isn’t the weak link of a mattress so for most people that aren’t in a higher than average weight range and who make a suitable firmness choice it would be fine. There is more about this in post #2 here and the posts it links to. The comfort layers are the biggest factor in the durability and useful life of a mattress and the latex is a very high quality and durable material.
Of course the “value” of a mattress depends on the parts of your personal value equation that are most important to you but they would certainly make a durable and good quality and value choice for most people compared to most other mattresses in their budget range or even budget ranges that are considerably higher.
Phoenix