I purchased Thea for Rhino as a replacement for Maxwell Render. I felt Maxwell wasnt well supported for Rhino compared to the other platforms they were supporting. Additionally, Maxwell seemed overly complicated and the amount of fine tuning required too much time for the minor improvement in results. Thea was a pleasant surprise. I hadnt heard too much about it but for the price and reviews I found, it seemed worth a gamble. I have not been disappointed. It is easy to learn, provides great results and there are just enough options to produce amazing renderings without constant tweaking. The free Substance Converter allows you to tweak and convert Allegorithmic procedural materials to Thea materials.