I am using it for k8s deployment and overall am quite happy that I can safely configure deployments without boilerplate. The k8s integration makes it easy to get started with, including using existing yaml configuration. Certainly though you have to invest some time to learn it and I have discovered a few rough edges.

I haven't seen another appealing solution in the space. I recommend using Kustomize if you can, but it is very limited in what you can do with it. When I looked at dhall-kubernetes it was lacking some crucial defaulting features that are getting integrated into the language now.