Hi rmf5007,
I would also want to know the density of the bottom two polyfoam layers.
This has all the “quality” specs you need to identify any weak links and make more meaningful comparisons with other mattresses. If you are in an “average” weight range or lower where thicker layers of medium density 4 lb memory foam are less risky (in terms of durability and PPP) then it could make a suitable choice. I would be cautious and reduce the amount of 4 lb memory foam in the comfort layers if you are in a higher weight range (about 200 lbs or higher). Assuming you have tested this mattress or one with a very similar design and/or based on your conversations with a retailer or manufacturer are confident it’s a good match for you in terms of PPP then it would certainly be worth considering as long as you are in an “average” or lower weight range and body type. If you haven’t tested a mattress in person or you aren’t sure that the design would be suitable for you then the exchange or return options may also be a more important part of your personal value equation so you still have good options available if your actual sleeping experience indicates that the mattress isn’t a good match for you.
Phoenix