Is React worth it? How complex does your site need to be before it becomes worthwhile?

React is pretty easy to start with, for me the question is when does redux and the madness in redux starter kit become worth it.

I'm curious how that ends up working out. It is intriguing and enticing to me, because I have had similar experiences that the most 'challenging' part of using react is the flux part not the actual react part. But I'm just a react newbie, and based on my experience so far, am scared to go 'off the common path' at all because it tends to end up being a royal mess for reasons I didn't have the experience to predict in advance. :)