Well, I've been using Node.JS in production for over two years, now. However, here is my experience:
- + I love love love working with ES6. There are so many JS tools which make debugging and monitoring a bliss
- + Modules for lots of things which make it a piece of cake to patch an application together
- + Lot's of freedom separate software for application, caching and serving cannot deliver
- + Super easy to write, version and replicate an application
- + Zero down-time is possible
- + Drop-and-run bundles: no complex installations and dependencies
- - The garbage collector might ruin your day, when it starts collecting a gigabyte of data at 9AM (might only be in my head, since the particular problem was already fixed in Node.JS)