Spigit has only one data model, which we source for the customer, and customers can create reports from this that are saved in their workspace. At this time all users are able to view these reports. There is no custom modeling for Spigit on the service itself.
Customers can do "mash ups" with other tools from within Power BI Desktop and then deploy to Powerbi.com if they have the licensing there.
Spigit does not support blending of data from other systems from within the Spigit application and workflow.
▲ Power BI - Data Source Options