Ivoclar Vivadent’s crowning achievement, to date, INHO. IPS D.sign is an extraordinary material. It’s synthetically grown, flourapetite crystaline structure is beautiful, when it is layered correctly. That being said, it is one of the most technique sensitive porcelains I have ever used. AND, with that being said, once I learned the conditions that it wanted to be fired in, I was able to replicate that daily, without challenge. It isn’t sold to be a production porcelain, but if you have the right techniques, it could certainly become a VERY good one, very quickly. Some of the things I love about it are; It’s stability under multiple firing schedules, it’s shade matching, out of the bottle (you nearly have no shade adjustment at staining), and mainly it’s abililty to retain the exact surface texture after a natural glaze, and the surface itself! This gets 2 thumbs up from me!