I would recommend that engineers look to try Django Waffle for feature development within a team setting; it really streamlines flipping features on and off for testing. I think the simplicity of Django Waffle is pretty great, but it may be a limitation for those developing far more complex products.
Feature Flags are well suited for apps which are being developed across numerous teams in order to extend and basically enable/disable whatever areas of the app you want. It's not really necessary for an individual developer or perhaps even a single team of developers, depending.
I found Django Waffle to work seamlessly with my Django-native codebase, and the implementation was extremely fast and intuitive. Gargoyle offers a bit more in the way of building more complicated code segments, but it's also more complex to implement. I use Django Waffle for nearly every project involving feature flipping.
We still utilize Git as our source control system but Feature Flags allow us to use Git in a less complex and more efficient way for our development needs.
I would say a large ROI considering the reduction in branching and merging we need to perform and also the ability to use common, up to date code across teams. There's a lot of shared code we make use of, particularly with identity and authentication and our entire identity platform which is essentially used by each feature.
