I like that it's very flexible with customization options available in different languages (English US / German).
Some features are not so intuitive at first glance but after some training you'll get used them quickly enough - e g., how do we add new fields or change existing ones? Customization! We needed more flexibility than what was provided by standard report templates from our ERP system; however even this could have been better if only there were fewer limitations when adding additional columns etc.; also sometimes reporting results take too much space which makes formatting difficult because they don't fit into one page easily anymore without scrolling down quite far already ;-).