As someone who has worn both the user and Administrator hats for Oracle Siebel, its absolute greatest strenght is it's unmatched data integrity and robust architecture for complex, large-scale enterprise workflows.

From an administrative standpoint the data model is incredibly mature. Once you properly configure your Business Components and joins the system handles massive, concurrent transactional loads without breaking a sweet for users, the sheer dept of customization means that if your business has a highly niche, multiple layered approval to fit it exactly the transition to the responsive Siebel Open UI was a massive leap forward finally freeing us from the shackles of internet Explorer and experience and streamline navigation paths. Review collected by and hosted on G2.com.

While Sible is incredibly powerful it demands a high level of governance and a structures approach to change management which can sometime slow down rapid agile deployments.

Because the architecture is so deeply integrated

applying updates or handling repository upgrades (IRM) requires rigorous regression testing to ensure complex configurations Don't break. it's definitely not a plug and play system it requires dedicated administrative ownership.

From a user experience standpoint, the out of the box interface can occasionally feel a bit dense and click-heavy compared to lighter. Review collected by and hosted on G2.com.