Travis Porter asked if there is any reason to upgrade to Pro SU over the free version. I thought that I would make a new thread so that those who are interested in this question might find my babbling more easily.
There aren't a great deal of differences between GSU and SU5Pro. the ones that exist are mostly related to file export. You can't export high res images, CAD files, animations or PDF documents from the free version. You can do all of those from the Pro version. There are a few other differences related to the use of some Ruby scripts. The pro version supports the addition of toolbars related to Plugins. This is mainly a convenience but there are several scripts, Housebuilder, Selection Tools and Projection Tools that each have enough tools to make toolbars useful. If you don't care about those scripts anyway that's moot.
When you get into SU6Pro, there get to be more differences. There are new rendering styles that add greatly to presentation quality, there is 3D Text, Photomatch, direction locking and some other things that were available only through the use of Ruby scripts. In addition to all the new stuff in SU6Pro, there is another application bundled with it called Layout. This gives you the ability to work with SU models to make presentation materials such as PDF documents or slides for a slide show. You can add title bars and text as well as multiple views of models. You can make multi page documents so you could, for example make a package with 3D views, 2D plans and text describing a project.
Of course the other reason for upgrading to Pro is the free version is for personal use only. If you are using SU for commercial use, you are supposed to buy the license for the pro version. When you installed the free one, you agreed to that condition.
FWIW, here are a few examples of SU6Pro output.
This house model was started in SU4 and worked on in SU5. I have a more complete version at home. I was just playing with one of the Sketchy styles.
Here's an example of 3D Text
I've done some other stuff over the last 2 months with SU6 but it's all on the home machine.