I just love this course and tell everybody about it at the Chinese school where I have a 2 1/2 hour-lesson once a week. It complements and puts me several steps ahead of my presential classes - everybody feels awed by the sentences I'm able to build, my vocabulary and sometimes the explanations about a certain term that even the Chinese teacher is not able to explain (sometimes it's difficult for a native person to explain the mechanism of his own language, because it's just so intuitive and automatic for him).