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Re:NixOS 16.09 released by edude03 on Tuesday October 04, 2016 @12:54AM (#12633418)
Just did the upgrade an hour ago (from 16.03) super fast and easy and everything still works. Great job nixos team.

For those wondering the procedure is basically nixos-channel add /path/to/16.09

nixos-rebuild switch --upgrade

Re:NixOS 16.09 released by cgdub on Tuesday October 04, 2016 @01:14AM (#12633463)
Because of how Nix works, upgrading should leave your system in an identical state as if you had done a fresh install.

You can even downgrade if you want. I've switched to unstable and back to 16.03 (and now to 16.09) without a reinstall and everything still works perfectly.