Just judging from the emails e-On keeps sending me...their main customers are pros. I gather Vue has become a Hollywood staple, for stuff like Avatar's fantasy jungle, Hunger Games, etc. Architects and engineers use it as well, to create "visualizations" of their projects, for bidding, etc.

The reason I bought Vue was because it did instancing so well. It's so easy to create a huge jungle, with each tree at a different angle and a different size and randomly spaced so it doesn't look like it's all one tree. It just has a ton of tools that let you automatically control where and how things "grow" so trees don't end up going through buildings, so grass can grow under trees but other trees can't, etc.

And despite improvements, I can't imagine doing massive forests in Poser or DS.