Aaron Wood, our Manager of Software Engineering and Support, created a 5-minute video to highlight the features you get with SPGA Free Edition.
(FYI, there is truly no "catch" with SPGA Free Edition. We would like to see more companies benefiting from automated SharePoint site provisioning (with proper governance) and have decided to adopt a "Freemium" model from here on out with the product. If the Free Edition features are all you need, then you can install and use the product on-premises with free permanent license key(s), forever. And yes, you can run it on multiple servers in a farm. And yes, we do sell annual support agreements, for professionally-staffed ticket-based technical support, for those companies that desire to have paid support on the Free Edition.)
Here is the video: