I first saw Sherlock Holmes in the theater. I loved the movie so I decided to pick up the movie on DVD when it came out. I picked up the Blu-ray that also has a DVD copy of the movie.
I think I've seen some other movies featuring Sherlock Holmes, but I can't remember much of anything from them. I think the story for this version is original, though I don't know for sure that it wasn't in one of the short stories or books. I think the story works very well and is interesting and entertaining. There is a decent amount of action throughout the movie without things getting too violent. There is some comedy too, usually in how Sherlock and Watson interact or react to certain things. The cast, especially Robert Downey Jr. is wonderful.
I did get a longer review posted on Epinions.