I just bought a Chiberta with D3D panels. I haven’t ridden in mine enough to know how it differs from my trainers but when I tried the saddle the D3D panels fit my horse so well and I too was impressed that the same saddle fit multiple other horses with great balance as well. I am new to Devoucoux though so not much experience with how they compare to other panels. I can say that I never considered getting a saddle with foam panels until I saw the panels on these saddles. I have been very impressed. Makes me feel like the saddle will fit well as my horses back changes throughout the year.
I can try to share some more pictures of the panels and the saddle on my horses back later if people are interested.