I think Olga is an extremely appealing character. One Piece could use more lolibabas. Other than that, there's not much to be said about this special. It has a solid plotline, decent original characters, it's well animated, and the characterization is not terribly off. What else could you possibly want from a non canonical special episode? It's also worth mentioning that it's a prequel to Film: GOLD, but it stands on its own, mostly just teasing some characters and events. I think I enjoyed it more than the film, even. In conclusion, watch this for Olga, ok? She's very cute.