The best thing I like about vault speed is that it has an inbuilt option to create our own dashboards with different reports. Also, there are many other tools which can be used along with vaultspeed. It's not always easy for me to understand all aspects of dashboard creation. But as far as customization goes, you will find everything you need here. For example, if your requirement includes multiple charts then this tool also provides them out-of-the box without any customisation required from end user. We have been using vault speed since last 3 years mainly because we require flexibility while creating Dashboard & Reports.