The Data Importer is a great tool to create an ETL. It generates code which is easy to maintain later without the tool.
One Identity Manager offers customization options for specific business processes, efficient identity and access management via automation, and integration with systems like SAP and Active Directory. It enhances compliance with role-based access control and audit trails. However, users report complex setup, insufficient support, and need for better integration with ServiceNow. Documentation is limited, which, along with scalability issues, particularly database performance, can impact large organizations.