I like how it's very customizable (you can add plugins for specific tasks), you don't need any extra libraries/components etc - just write your code in plain vanilla php. There are many different ways of doing almost everything with banshee so if there isn't an existing solution then writing one could be quite straightforward too! The documentation needs some work but i think that will come eventually as more people start using this tool.
If you're looking to build something quick-and-dirtyβ¦