I have not used it yet despite the fact I work on the analytics / data science team who also uses the full Azure stack with PowerBI. This is mostly because we don't use SSAS and do all that complex stuff on the back-end so you don't have to do all this complex scripting on the front-end.

Though, I would imagine in most use cases, it's going to be beneficial to learn. Seems pretty powerful if that's your thing.