I like how easy it was to setup our data sources in RSI's platform as well as their support team for any issues we might run into with this product! We were able use all of the features available within the tool without having to worry about needing additional licenses or training staff members who are not familiar with SQL Server Reporting Services (SSRS).
The only thing i dislike when using RSI is you cannot have multiple users access your dashboard at one time so if there is someone else working from home they can't see what you're seeing unless both people log out/in which isn't always convenient and could be confusing. Having an integrated solution between SSAS cubes allows us to provide more value by combining different datasets together seamlessly through reports rather than pulling each dataset separately via queries.