We used Piwik to handle our analytics, being that we were an open-source project and trying to save tax dollars it seemed the perfect fit. Our main usage was to track which areas of our site were more popular, and to find out what areas of the world were where the concentration of where our users were. It was not the only product being used in our organization, but the only one that we worked with directly. We found it to be slightly more user-friendly than Urchin and the learning curve was very reasonable. After a short time we had the product up and running, we could produce the reports we needed and we were very happy with the general stability of the product.