Ease of use. There are multiple ways to do the same thing (navigation bar, starburst menu, or main screen). Easy to find existing reports if company organizes it well. User's don't have to worry about relationships between data sets if the admin sets up the system well.
Data may be hard to find but it greatly depends on how your company decides to organize it. Sometimes a little unstable (online version) but most issues are due to your company's server capabilities. Some reports take a VERY LONG time to run but once again, most of that due to how much data the system has in it PLUS the server capability.
This software is comparable to other Report Writers...Crystal Reports, Cognos Impromptu, etc. in that a user can easily create reports from data that is coming from various company wide applications and then either format and print OR export to Excel.
Being able to easily run reports from data that is coming from various sources within the company.