[drdiablo]

It's instant feedback. You should try making an app with animations. You leave the animation looping and you modify your constants and you don't have to reload or do anything, ReactHotLoader will plug in your new code without losing the state of the app.

You get much faster prototyping, collaborative tools out of the box and even a debugger with a timeline out of the box (you just have to save your state at every change and have a little scrollbar to scroll through your states). This is very very powerful.