Hi
Actually, I have watched it some time ago.
Just too depressed and busy to post abt it.

Conclusion
-- Recommended.

Hmmm ... from movie making/editing point of view ... I am just wondering, the first 2 or 3 min, is it really necessary to show the various cast/readers convening in the hall, chatting, mingering, then sitting down in a row to start reading their lines ... 

Reason: The expressions/mood captured may not set the tone for what is going to be demanded of in the documentary ... IMHO, there are better ways to feature the cast ...

For those interested, there is another freely available documentary on youtube (made by the director himself) ...
He has recently dubbed it in Japanese too ...

The Rape of Nanking (Nanjing) (aka Nightmare in Nanking)
director Rhawn Joseph 

Not documentary, there are at least 2 more films that will be screened this year about Nanking

(1) The Children of Huang Shi
director Roger Spottiswoode

(2) Nanking Nanking
director Lu Chuan