Dude, where are my bytes: introducing 'Duc', a tool for inspecting disk usage

I've been working on a tool to help find out where your disk space has gone; it's called Duc (du-cached), and consists of a few tools to create indexes of directory trees and create nifty interactive sunburst graphs to help you to understand your disk usage.

Screenshot: https://github.com/zevv/duc/raw/master/img/example.png

Git repo: https://github.com/zevv/duc

Duc scales quite well, it has been tested on quite large systems with more then 500 million files and several petabyte of storage.

I'm looking for some people who would like to give Duc a go on their systems to see how it holds out in the field. If you think if it is of any use to you, give it a spin and let me know your results!

(PS. Also posted in /r/sysadmin recently, but /r/linuxadmin seems a more appropriate place)