It was used to track monthly compenstation and quota attainment for 200+ sales reps as well as payout any monthly bonuses attached to overall sales numbers. Monthly reports and analysis was done from this data to show reps and management everyones progress. It was used by multiple departments: Sales ops, finance, and HR
The main roadblock for Xactly is the hierarchy setup, that can be very tricky to get the hang of, and can be very different for each organization. That can create searching for solutions a bit trickier. Once you have the hierarchy setup then the monthly attainment data and reporting is a lot easier.