Well, I’ve been using SUbD since it was released two months ago. SUbD is an extension for SketchUp to get parametric subdivisions. After some heavy testing, all I can say is this plugin is really delightful! As far as I’ve tried, there’s a couple of plugins really recommended to use alongside SUbD: Vertex Tools and QuadFace Tools (also made by the same author, Thomas Thomassen). They’re perfect companions for SUbD, providing tools specifically designed to work with quads. It makes the workflow significantly stronger and easier.
Here you can have a look to a wide tire I’ve made with SketchUp, SUbD and a little bit of Thea Render and Photoshop. It’s completely made with quads and it precised two subdivisions.
And last but not least, you can also check the subdivided control mesh and the previous state of the wheel.
Download this model