Modeler is a game changer for general modeling in Houdini. Alexey really understands what modelers need in terms of workflows. I think an important subset of procedural modeling is NON-procedural modeling. These are basic tools that can be used every day. The Pen tool is the best I have seen in any program ever. It is amazing what Alexey has done with the new modeler. It's essentially a totally different modeling program that lives on top of Houdini. Yet you can still be as procedural as you want in the network editor. If you are interested in modeling in Houdini you should pick this up. Well worth the money.