I like that it's easy to use without any coding ability or technical knowledge required at all, so anyone can get up and running with this system quickly. As others have mentioned, there could be more visualizations available (more than 3 dimensions) for each chart type. We've been using query tree since our first version of Oracle BI Publisher 10 years ago. One key benefit is the fact that you don't need to write SQL code at all - the data sources are already written in XML format. This makes deployment easier as well because there isn't anything needing to be installed apart from the software itself. Another thing we appreciate about query tree is its very responsive support team. They're always ready to help out when needed! Our organization has multiple teams working together across different offices and continents, having access to an easily deployable business intelligence tool such as query tree really helps.