I like how easy it is to deploy, configure & manage across all environments (dev/test / stage-prod).
It's also very flexible in terms of configuration options which makes troubleshooting issues much easier than with other products out there! The UI could be more intuitive - but this comes down mainly from personal preference rather then anything specific about functionality or product itself :) Currently using for authentication at our office as well has been great so far! We've had zero security incidents since deploying tfs 2018 version 1 few months ago now ;) Have used many different auth providers over time such us ADFS etc.. This one works best overall compared others we have tried previously :D Also happy they're moving towards OIDC standardisation too instead having their own proprietary protocol. Highly recommended if you are looking into an open source solution where your budget allows!! If not use AWS Cognito Auth provider otherwise.