I have used this site in second-semester French language courses(community college level) for years. It is effective in its use of realia and culturally-authentic graphics. Students get a real sense of the appropriate context in which to use all terms. For example, in the section on schools, students can actually take virtual visits to French and Francophone schools and see the program of studies there. They have a grasp of "la vie quotidienne" in a variety of subject areas.
I use le Lexique to extend the themes covered in the second-semester textbook, French in Action. The students do cross-cultural comparisons and their discussions and compositions are supported by information in the Lexique.
The site is easy to navigate and visually attractive. The graphics serve a purpose and are well-chosen.