An Introduction to Nix for Ruby Developers

Link: An Introduction to Nix for Ruby Developers: "Learn how to build and share reproducible Rails development environments."

Wow, I've heard about Nix from time to time. I still don't understand it. But the linked article is the first fairly comprehensive one with a detailed tutorial. Of course I am still too scared to try typing in the commands. They seem to claim that it will be totally isolated but still. Mainly I am not sure what benefit I will get in trying it. You can see though, that someone's have put a ton of effort into getting it to this point.