If you've been following recent trends in Blender community you're probably familiar with what PBR is (for those of you who don't know it's physically based rendering). Unfortunately for many artists the subject is quite difficult to implement because of it technical bias. That's why I (confidently understanding all the intricacies of physical optics) decided to combine many physical principles, effects and phenomena into one easy to use shader.From a physicist for artists:
Being a physicist I was able to make sure that accuracy and consistency of models implemented in the shader are unprecedented for the Blender Market. But being also an artist I endeavored to make these models easy to use and understand.Should you buy it?
Totally yes, if your work with Blender is tightly connected with rendering. Ability to create realistic materials and to forever forget endless process of trial and error when constructing good-looking shader is at your arm's length.
If you are still not convinced that this product is for you, or can’t see the difference between this and other (maybe even cheaper) pbr shaders on the Market, then have a look at the list of features (all images below are renders, done with UNIVERSAL uber-shader):