I personally use #NixOS. The declarative nature of it is so nice.
It enables me to share common configuration between different computers while still allowing host specific differences without relying on hacky solutions like #chezmoi.
Not knocking chezmoi, it’s great and I used it for years, I just prefer the home-manager module for NixOS.
I have seen a lot about Nix recently, and I must admit I’m really intrigued. I definitely want to play around with it more. Conceptually, it does sound pretty cool.
I like it, but don’t expect it to save you any time unless your managing 3+ computers.
Yeah, it definitely seems aimed way more at cluster deployments. Still, a very cool concept to tailor the OS towards.