It was installed at a previous company I worked for, and they used it extensively there. It was cross-platform, so it was more than just SQL Server. It could work with SQL Server, Postgres and do all of the system metrics, such as RAM consumption, IO, network traffic, etc. It was a more in-depth package, but it was also rather expensive if I remember it correctly.
In my current company, I'm a new principal DBA. They hired me a week and a half ago, and I'm evaluating solutions to possibly purchase.
In terms of deployment, it has both on-prem and cloud deployments.
Monitoring is most valuable, and being able to know that there is an issue or problem and I need to go look is also valuable. So, monitoring and learning are the most important features.