Relatively new NixOS user here: I consider Nix{,OS} and Guix{,SD} the future approach to build a GNU/Linux distro and in general the way to manage a modern OS. Simple as that.
My main pain point with NixOS is it's obscure DSL, instead of the excellent Scheme, my pain point with GuixSD testing is absence of LVM support and less flexibility to create custom installer config than NixOS (for instance I'm a nilfs2 user for all fs and while it's extremely easy to have a root on nilfs2 with NixOS it's tricky on GuixSD).
For the rest it awesome:
- fully reproducible deploy (included NixOps and homeManager)
- safe update, being symlink-based we get poor man's Opensolaris BEs for both config changes, update and even major release upgrade
- can manage nearly all inside home via homeManager
- can deploy a series of hosts via NixOps, like a built-in Saltstack on steroid.
My main pain point with NixOS is it's obscure DSL, instead of the excellent Scheme, my pain point with GuixSD testing is absence of LVM support and less flexibility to create custom installer config than NixOS (for instance I'm a nilfs2 user for all fs and while it's extremely easy to have a root on nilfs2 with NixOS it's tricky on GuixSD).
For the rest it awesome:
- fully reproducible deploy (included NixOps and homeManager)
- safe update, being symlink-based we get poor man's Opensolaris BEs for both config changes, update and even major release upgrade
- can manage nearly all inside home via homeManager
- can deploy a series of hosts via NixOps, like a built-in Saltstack on steroid.