Very fast to develop graphs/charts with data sets that we are not used in R or other statistics software packages like Stata etc., it has many options available which is very handy when you want your graph look just right without wasting time tinkering here n there till its perfect! No cons as such but if i can suggest anything then maybe give more examples of using different features so people dont get confused while trying out new things by reading documentation only;) I have developed few dashboards where my clients needed some customizations at times because this library supports customization quite well (as far user experience goes). Also helps me keep all work related files within one place easily accessible whenever required.- It's easy enought even an accountant who knows nothing about programming could use- The community support provided along side makes development process much easier than working around random tutorials from.