Personally I have used waterfall chart for my presentation in the company for the demonstration of graph purpose. I find it quite usefull and would definately come to it whenever in need.
We have Finance data which requires more of a data visualization than calculation. The Visiochart helps both interms of Represntation calculation and Visulaiization with very ease of implementation. The Integration with Datatbase is very easy and the use has increased. The Customer support for the tool is very strong. Also The Charts and Flow Diagrams are very easy to understand and increasing usage.