It's very powerful for rendering complex scenes with lots of details, it has great features like dynamic lights or materials that can be used in real time without having too many problems (CPU usage). There are some bugs here an there but nothing serious so far :), i have been using this software since my first projects at university years ago when I was studying Computer Graphics as part design visualization purposes only ;-) Nowadays we use renderman mostly because its free compared other alternatives such us V-Ray which costs money! The best feature about Renders Man Pro from me would probably by how easy you get into learning all those functions once your familiarize yourself whit them they become almost natural! For example if u want just make simple lighting effects then everything will work fine outta box no need any plugins etc.. But what really makes renders man stand above others.