Oh, I'm a big fan of logistic regressions. And this model actually has some logistic regression in the mix. But I just used this break down of 5 groups to easily report the performance of the model. I can also report a gini but it is way more visceral to see "this is who I predicted to be my top performing group, this is how big that group was, and this is how they actually performed."

In general your work may be complicated/sophisticated. But your results need to be simple.