The edition includes all of Sidney Paget's original illustrations from The Strand Magazine, and also include many of the illustrations created by the American press when the stories were reprinted here. It was kind of entertaining to see the dramatic differences in a scene illustrated by Paget and the same scene illustrated by an American magazine.
These books are a little pricey, but well worth it for fans of the Sherlock Holmes stories. If I'm good, maybe I'll get the second volume for my birthday--that one includes stories from The Return of Sherlock Holmes, His Last Bow, and The Casebook of Sherlock Holmes. The third volume contains the four Sherlock Holmes novels.
And in case you're wondering--in all, there are 56 short stories, and four novels in what Sherlockians call "the canon." If you haven't read them, you should give them a try--they're timeless.