A few people seem to be hung up on the fact that this is an abridged version of the text. Of course it is, but it is still a useful study aid. Reading any play is difficult as it is meant to be seen, not read. This is especially true of Shakespeare, who almost never included stage directions, and often had a very large cast of characters. Keeping track of who is on stage doing or saying what, on top of the often very difficult language is not easy for anyone reading it for the first time. On the other hand, a film or stage production can often be too fast paced for someone not used to the language to keep up. A comic book is ideal because it takes the unnecessary mental strain out of reading rather than watching the play, but you can take it at your own pace.
As a study tool this is great for getting to know the story and the characters. Then when you come to read the play it becomes much easier to concentrate on the language. It would also be very handy if you have to read the play in a short space of time. I know I would have found this very handy when I was doing my Drama degree.
Not that it's just a study book, I personally bought it simply out of interest and found it very enjoyable. I never liked The Tempest before but this version makes it accessible while bringing out some of Shakespeare's great poetry. Even though it's labeled as Manga Shakespeare, the art is not the usual cookie-cutter stuff usually littering the comics section at the bookshops - it is unique and imaginative; its expressive style is very suited to the story.