I've heard of it, but haven't tried it. Generally, the less additional software to maintain, learn and use, the better the workflow, that's why we've put a lot of time in getting into DataCAD and pushing it to get the most out of it. All our modelling for 3D work is done in DataCAD (combination of smart entities and standard 3D entities) and then carried forward for renders/animation in other software such as Maxwell, with construction docs all done in DataCAD. The Object Viewer and your Sunshader is used a lot to view designs as they progress without the need to export to external visualisation software, and the quickness of switching back and forth helps the workflow. What would be good is a "universal" translator that imports a wide range of 3D formats from other platforms, especially where product manufacturer's have created models in formats that DataCAD isn't able to import directly.
If you're bored and twiddling your thumbs a suggestion would be to further develop the Sunshader, perhaps rename it SketchShader and add extra presentation features so it can be used more for the upfront early concept phase of a project....