The best feature of renderman or at least one that i have used it, its speed in rendering images/animations for realtime applications! It's very easy as well but not too user friendly if you are newbie like me!! I think there should be more tutorials online with this software because sometimes getting started can get quite scary especially when your first time using such an advanced tool (rendering). Also some features could use improvement so maybe they will add those later down future versions which would make things easier than before since everything was kind hard now days due how advance technology has become nowadays compared from then back years ago. Make sure what version number u download and install cause earlier ones might take longer times compare after installing latest update available out their website. ! And also do research about other softwares similar products already existent today. !! Definitely worth try once though don.