Hi Basil,
I would be cautious with buying from liquidation or clearance stores like The Dump (see post #8 here) and at the very least I would check any mattress carefully for any evidence of use and make sure that it has a manufacturers warranty.
The Paramount HD mattresses generally use some higher quality/density materials inside them but the only way to know whether a mattress has any weak links in terms of durability is to make sure you know the specifics of all the layers and components inside it (see this article). Without knowing this information there isn’t any way to make any meaningful comments about the quality or the durability of a mattress. If you can find out all the information I would need about the type and quality of the materials and components inside it I’d be happy to make some comments about the quality of the materials and the mattress as a whole but it may be difficult to find the information that you need (see posts #5 and #6 here and post #2 here).
Both of these use Talalay latex which is a good quality material in any version and there are no weak links in either mattress but the Beautiful uses blended Talalay which is a little more durable in the softer ILD’s especially than the 100% natural Talalay made by Latex International. The latex in the Renew isn’t organic (there is no organic Talalay latex). The Pure Latex Bliss so called “organic” line uses wool in the quilting which would change the feel and resilience of the sleeping surface compared to the Beautiful which has a thinner knit cover with more stretch so you would be sleeping more directly on the latex. The 100% natural Talalay wouldn’t develop hard spots but it will get softer faster than the blend under the heavier areas of your body. They are also very costly compared to other mattresses that also use 100% natural talalay and have a wool quilted cover in the same thickness. Pure Latex Bliss has MAP pricing (minimum advertised pricing) so retailers can’t advertise lower pricing but if you do decide to purchase a Pure Latex Bliss mattress then post #32 here has a list of retailers that sell them online that may be able to supply the same mattress at lower prices (if you talk with them on the phone) that you could use for price or value comparisons.
Phoenix