The user interface is very good, it's easy to use for both administrators as well users so they can configure their personal profile with ease! It also has an excellent API which allows integration of applications that requires authentication from third parties such like Google or Facebook (for example). There are no downsides at all in my opinion but if you want something more robust than basic access control features then this might not be suitable solution since most companies already have other solutions available out there - however we were looking purely into implementing simple roles-based authorization using SAML SSO logins without any additional plugins/solutions required by endusers etc..