University of Nebraska is using Grouper in production.   

Types of Data in UNL Grouper:

• Student data

• Registration status

• Majors/Minors

• Course enrollments (incl. Instructors)

• Employee data

• Department

• Affiliation

• Position

• Housing, residence halls

• Key managers

See this page for more info and a slide deck presentation on Grouper at UNL