First attempt to use was of course just connect and make it work :-).
The basic access works out of the box:
$ /usr/lib/colorhug-client/colorhug get-firmware-version 1.0.3 $ /usr/lib/colorhug-client/colorhug get-hardware-version Hardware Version 1 $ /usr/lib/colorhug-client/colorhug get-serial-number 000019
Unfortunately calibration with colord does not yet work out of the box on Debian due to bug 655888. Hopefully it will be fixed soon and it will work nicer. For now you have to rebuild Argyll with Colorhug support (with extra pain caused by Debian package using different build system than upstream). I won't provided binary packages as I pretty much gave up after effort to build clean packages from same sources on i386 and amd64, which always failed on patched autoconf based build system.
Side note: I somehow hoped that I won't hit new (in meaning that I don't know them) open source projects which do not use some version control. Unfortunately Argyll CMS is one of such projects...
After this update (and restarting GNOME), when connecting ColorHug, the Gnome Color Manager pops up and man can calibrate the screen. The biggest problem is to make ColorHug hold on desired place on screen, if it is not close enough to screen, you will get really bad results.
The first result is of course far from being perfect, but colors are definitely better than without calibration or with ICC profile shipped with notebook.