• Red Hat SSO has a lot of very concise, well laid out documentation, which is available in the free edition as well.
• It is fast and effective.
  
• It is very easy to scale and use as you want. 
• It provides a single pane of glass if you have deployed it across multiple clusters.
• The product keeps to standardized SSO protocols, so it would be easy switch to another SSO, if needed.
• It provides good tool tips.
• It allows for a lot of customization, such as, federation. 
• It provides you endpoints as plugins or you can write on your own.
• It integrates well with social logins, like Facebook, Yahoo, and Google Identity.

The product’s most valuable feature is its ability to assign only one password for the user at a false value.

Red Hat SSO integrates well with our other solutions. Using OIDC protocols and ITL integration, employees can authenticate with Red Hat SSO and access our microservices. 

I like that the solution is open source and you can use a commercial edition of it without any charge. The professional version or the enterprise edition was very reasonably priced and it provided most of the features that other enterprise editions provided. It was a lot more extensible. There was good support for some of the latest protocols, like single sign-on protocols for features such as OpenID Connect.