People love Nix because of the OS configuration based around a single config file. Essentially, you define your system configuration in this file, including installed programs, then you rebuild your system based on that configuration.

The beauty here is that you can easily move this file to another machine running NixOS and reproduce your configuration there. You can also roll back changes by simply rebooting and choosing the last known good build and you’re back in business.

I used NixOS for a couple of years. My experience is like this:

1. It is a rolling release (mostly)
2. You write a declarative configuration for your system, e.g., my config will say I want Neovim with certain plugins, and I can also include my Neovim configuration
3. It is stable, and when it breaks it is easy to go back
4. Packages are mostly bleeding edge