Pentaho has achieved a deep, first-class integration with MongoDB, providing a native and full support for MongoDB Replica Sets, Tag Sets and Read and Write Preferences. This is a significant shift from the traditional, low-fidelity integrations that many other BI tools offer, which can only provide limited access to NoSQL databases like MongoDB. The high level of native integration enables users to specify their read preferences and take advantage of MongoDB's data model, setting Pentaho apart in its support for modern data sources.