In my limited experience D-Nail has some high quality products when it comes to your typical materials like quartz, ruby or sic. I have one of their quartz halos on top of my VROD and it's nice enough even being a factory second.
I haven't tried any of their fancy pants trademarked materials and don't think I'll ever throw that kind of cash around. I'm interested in these materials like the diamondium as they are unique and seem somewhat well researched but they are hard to find info on due to being unique to D-Nail and having a very small user base that don't seem to post in public spaces being often. Usually Instagram is where I go to look at cutting edge bleeding wallet dab tech but it's certainly not the info base a forum like this can be!