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It's in use in production. We are using it in our internal apps now. Some apps in Japan have been appearing in the App Store using it, such as: https://itunes.apple.com/jp/app/id1088140538.

I would recommend trying to build an app using a DIY store following the principles first to get a really good feel for how it fits in. Moving from DIY -> ReduxKit -> ReSwift has been really easy.

Yes, I would consider it production ready. The library itself is really small, which means you don't paint yourself in a corner by using it.

We're still early on, so there are many different implementation patterns that might evolve around the core library but in my experience and that of other devs I've talked to it is already a pretty good step forward from an MVC approach.

Yes. I am about to ship an app with it and am working on a second one also using it.