NixOS as a server OS?

I used to have a VPS running a traditional OS (CentOS) that I eventually got rid of. One of the reasons I tried to migrate away from it was from the sysadmin perspective, I felt like the server once everything was configured was a bit of a snowflake.

Obviously configuring everything through nix and being able to easily rollback changes sound very compelling.

Have folks used nix as a server OS? How's your experience been?