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:
You're right about the boilerplate. I use a wrapper around React.createClass to take care of that. Kinda similar to Marty.createStateMixin, but it's just a component factory.
The Chrome plugin looks very nice, but you can do the same thing with console.log() outputs in your store. It's a nice to have, but not filling a need for me.
The Chrome plugin looks very nice, but you can do the same thing with console.log() outputs in your store. It's a nice to have, but not filling a need for me.