This is the module which brings everything under a single management umbrella and this is what makes it different from other vendors. Just add any number of NetVoyant, ReportAnalyzer, and ADA servers as required to your environment and add them as a data source in NPC to have all the management, monitoring, and reporting in a single interface!
Having extensive experience with Solarwinds, Whatsup, and ManageEngine I can say this was a new and different experience. I still will vote for Solarwinds for its user interface but in terms of scalability I have not seen any other product like NetQoS. This is a product for very large enterprises and service providers with large number of network devices and applications running.