If you want to read Alan Moore's work, do not get this! The screenplay has a storyline that is very different than Moore's original graphic novel. Reasons to get this version
1) You want to relive the movie
2) You are a big fan of Dorian Gray (who is not in Moore's original)
3) You like Siberia depicted in comic books.
4) You are not interested in edgy mature graphic novels like Moore's.
Personally, I found the storyline of Moore's original much more interesting and have no plans to want to relive the movie.