Not being huffy, just saying that it's Linux Mint. There is no COS, it doesn't exist.
I gave it a download (disc 1) and ran it from the live CD, and yeah that's exactly what it is. It's Linux mint with a CUSA wallpaper and a blue Gnome theme with the chickenhead logo plonked in various locations, and err.. that's it.
They didn't even change the bootscreen, after you select the boot you get the Linux Mint boot logo.