It's relatively easy to set up and doesn't require special expertise. Since Excel reports can be linked to other Excel files users retain the full flexibility and power of workbooks, including dynamic reports. Users retain full control of the data presentation, formatting and the printing setup.
Users can drill down reports for details right to the source of the data.
Access to files can be restricted with network security. All the data are available with a click of a mouse and can be stored as archives in one place. I know, because I've done it. I'm the accounting manager of a small public company. One of my responsibilities is to provide management with monthly financial reports.