I've never really understood this, what's so hard about "apt-get install xfce" and choosing that from the gdm menu instead of Unity? Why is there an entire secondary project for something that used to be a checkbox choice on Debian and Redhat?

if you've got an old computer that you're trying to make useful, it's a lot easier (for most users, who can't config the alt-installer) to just download and burn xubuntu.