They did have an very ambitious aim to create more than 50 books in 8 different levels. I got some of the low levels and they are very good reading material giving excellent practicing without an overflow of new words/characters. However, the higher levels are still not out and their homepages are gone and no info to be found if there ever will come any more books. Anyone know anything about it? For beginners I can recommend the books a very good reading material with a good structure and also comes with audio book files in different speed. This for around 15 块。