This documentary is beautifully shot and the interpretation of the quartet is fantastic.
But watching it, I could not help but wonder why the makers choose this piece as the center of a Debussy documentary. It is without doubt beautiful, yet it lacks certain qualities and innovations that become more apparent in his later works. This means that the most important aspects in Debussy's style - fluid tonality, exceptional use of instrumentation- are not discussed at all. Also, the biographical information supplied is superficial and incomplete, and the individual movements of the string quartet are embellished by scenes showing people drinking coffee, ladies fanning themselves or lascivious dancers in exotic costumes, which is somewhat off putting and has no informative value or in fact any relation to the music heard.
All in all there is no need at all to buy this DVD, just buy a sound recording of the string quartet, another one of Debussy's orchestral works and consult your local library for a Debussy biography and you will learn much more. In fact, Wikipedia is more informative!
Needless to say, this DVD is quite a disappointment.