Yes, I have the box set and like all the sets in the Treasures series, it's an absolutely fantastic trove of cinematic history. The sets all include a thick booklet with wonderful notes about the background of each film and, in the case of the silent films, the new accompanying music. The films vary from fragments a few seconds long to feature length.
You can read up on all the box sets (there are now four) at the National Film Preservation Foundation's website: