The ability to render any scene in real time! I mean it's like magic, you just drop your model into one window or open up multiple windows depending how many scenes are required at once (which can be hundreds).
There isn't much that requires additional software other than some plugins from Autodesk but those aren't too difficult nor do they need extra licenses which would make this product even more expensive if purchased separately. It makes rendering so simple anyone could use them without having special training/experience - no matter what type of work you're doing as long as there is something rendered out every day.