Hey, author here. This is a repeat of my answer below but it's right down the bottom so might be missed:

I found that no other Flux implementation really helped with fetching data in a Fluxy way. There tended to be a lot of boiler plate code for binding stores to components. Furthermore, there was a lack of tooling for debugging. Marty helps combat these issues by introducing a number of new things:

- Fetch API for fetching data asynchronously without callbacks http://martyjs.org/guides/stores/fetching-data.html - State Mixins for binding stores to views http://martyjs.org/api/state-mixin/ - State sources for syncing state from heterogeneous sources http://martyjs.org/guides/state-sources/index.html - Chrome Developer extension (beta) for visualising the data flow and state of stores http://martyjs.org/devtools/