Well, this episode just summarizes the story from multiple episodes that contain KID, and works as a pre-moive 08 episode or a trailer and tries to make everyone interested in the fight between Conan and KID. If you are into watching every moment of Detective Conan that you can get then feel free to watch it, other than that treat it as a trailer for movie 08 and just go watch the movie. Without going into spoilers territory this episode might get you interested in re-watching some of KID's episodes and trying to remember what tricks did he use but since there is no plot developmentand no actual conflict in the episode you might not enjoy it.