NumXL is an extremely useful suite of statistical analysis tools that allow users to easily perform a wide set of tasks relevant to empirical work ranging from data summary to forecasting. The interface is intuitive and easy to use and the application is constantly being updated and further developed. The app itself deserves high praise as I do not think there is any comparable tool at least for Excel. However, in my opinion, the responsiveness and genuine customer service vocation of the team of developers is what sets NumXL apart from other Excel add-ins. The team behind NumXL is very eager to troubleshoot the app with a confused user (even late on a sunny Friday afternoon via phone) or to choose which features to add next based on customer surveys. Add to this a comprehensive set of white papers and examples and the result is an absolutely indispensable software for anyone doing empirical work using Excel (financial analysts, scientists, marketing analysts, journalists, office managers, supply chain managers, etc.).

Heaps of functionality, very easy to use (even for a non-expert) and a level of customer support that is truly exceptional.

The easyness of use is great. I also like the extended youtube tutorials and bootcamps that'll get you up to speed in no time. The customer service is second to none, an example for many around.