As a customer, once thing I note and I appreciate a lot:  (as highlighted by Afrodite-Ohki) the fact that we buy an item made for Poser11, and we can download a freebie the corrects the mats for Poser12. And as the room on hard disks is huge nowadays (my first hard disk costed 1'800$  for 10Mb) it's easy to have both material settings side-by-side.

𝒫𝒽𝓎𝓁

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👿 Win11 on i9-13900K@5GHz, 64GB, RoG Strix B760F Gamng, Asus Tuf Gaming RTX 4070 OC Edition, 1 TB SSD, 6+4+8TB HD
👿 Mac Mini M2, Sequoia 15.2, 16GB, 500GB SSD
👿 Nas 10TB
👿 Poser 13 and soon 14 ❤️