Hi Kfox,
Welcome to our Mattress Forum! 
Unfortunately, Casper does not list any meaningful information nor were we able to find the specifics of the reworked Original mattress. If you or other subscribers here manage to somehow find out the information listed here and list the “quality specs” on the forum I’d be happy to make some comments about the quality of the materials inside it and help compare the materials to the guidelines here to identify any weak links in the mattress.
Regardless of what the foam is called or if it is zoned or not I’d keep in mind that the weak link of a mattress is almost always in the use of low-quality materials in the comfort layers and if you don’t know the specifics of what is inside a mattress that you are considering you would be basically making a completely “blind” purchase both in terms of both suitability and durability of this mattress.
I am not sure what you’ve read since you reached our site but generally, I’d make sure that at least you scanned through the tutorial post here which has all the basic information, steps, and guidelines you will need to make the best possible choices … and know how and why to avoid the worst ones which would include the major brands such as Serta or any mattress where you aren’t able to find out the quality of the materials inside it.
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of “comfort”, firmness, and PPP that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well he will sleep), durability (how long he will sleep well), and the overall value of a mattress compared to your other finalists based on all the parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase if your choice doesn’t turn out as well as you hoped for).
You can read some recent consumer comments about Casper customer support experiences and a few other comments about the loss of support and Casper sagging issues within two months of use.
I hope some of the information here can help you move forward in your mattress search.
Phoenix