Hi espiritone,
The Tempurpedic Deluxe had …
1.2" of 5.3 lb memory foam
2.8" of 5.3 lb memory foam
Two 3" layers (total 6") of convoluted 2.2 lb polyfoam.
This would be one of their firmer mattresses and the quality of all the layers is good with no weak links and while the price you are looking at would be good value (depending on the size as well of course) … it would have little to no value to you (and could make things worse) if it didn’t provide you with the PPP (Pressure relief, Posture and alignment, and Personal preferences) that “match” your body type, sleeping style, and preferences (see post #46 here).
Phoenix