I like how easy it is to use and customize with your own data sources. It's also very quick loading times. When you have multiple maps open in one document, it can be difficult to navigate between them. You can't simply click on another map in the same document. This makes it difficult to switch quickly between different maps in the same document. If I need to create something that requires more than 1 map, I will use multiple documents instead of using geoBI. This allows me to easily move between multiple maps in the same document.