What do you like best?
The ability to use the various datasources as a backend (prometheus, graphite, even elasticsearch), the ability to automate the deployment of Grafana itself (even the dashboards provisioning, which is great).
Documentation is very well, and especially, I love the kiosk mode.
Template variables are the best!
What do you dislike?
Alerting. It's really pitiful, because the alerting ability is very limited. You can't do math on it and you can't select popular business-messengers or alermanager.
Recommendations to others considering the product:
You need to spend some time initially to understand which metrics and in which ways you want to show, because it's very easy to make bad dashboards, but quite complex to make them really useful
What problems are you solving with the product? What benefits have you realized?
The ability to have a quick overview of the project health itself, also we the ability to have the screens in the office, which are 24x7 playing the Grafana playlists