Richard Valley does a good job giving the watcher background on the second Sherlock Holmes feature starring Basil Rathbone and Nigel Bruce (and the last of their Sherlock movies to be set in the Victorian era. I've only listened to it once but my main complaint with Valley's commentary is that I don't like his voice. It's not god awful but I found I found that I didn't enjoy listening to it as much as David Stuart Davies's commentaries on the other movies in the series. That being said he still does a very good job giving information about the movie and analysing its pros and cons. And I must agree with him that George Zucco plays the best Moriarty out of the three actors who betrayed him in the Rathbone and Bruce series of films.

So it has it's faults but it's definitely worth a listen.