Well, we have been using it at work as a part of our SCADA solution for some time now, and it's definitely suited for production environments. If your major workload is IO-related and data processing in a heterogeneous environment, then Node-RED and NodeJS in general are worth a try.
Plus, the Node-RED developers take great care of backward compatibility, I have never experienced any major issues when upgrading.
I gave an overview of our use-case here: Increase canvas size? (supersize flows!)
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