These packs are not just PBR, they also have hundreds of fully procedural materials. If you want to learn how to build your own layered, procedural Redshift materials, this is a great pack to study. Or if you just want that extra freedom to control the amount of rust, mold, paint, dirt, and lichen using simple sliders, then this is the pack for you!
With the materials in the Redshift C4D bundle and the Redshift Mutating Materials bundle alone, you have all the assets you need to cover almost any surface you can imagine!