[pxc]

I want to second this experience. I've never actually submitted my contributions upstream for other distros, but I've maintained repositories for personal use for Ubuntu, openSUSE, Arch, Gentoo, CentOS and Fedora.

Writing a new package from scratch based on Nixpkgs is far easier than for other distros, and easy packaging tasks are much easier with Nixpkgs than with other distributions.

(It's also much easier to distribute packages without standing up new infrastructure with Nix, since it's source-based and will fall back to source-based builds if you have no established mechanism for distributing binaries.)