I have the 2000 edition and I am planning to buy the new one as indeed the guide has been an invaluable companion in travelling around Greece, even though I am a Greek! Detailed info of the 2000 edition is now out of date (change of currency from drs. to Euro, change of prices, change of ferry schedules etc.) but overall the book has been very useful to me in past years in chosing which island to visit, even among the most remote ones like Kastellorizo, Leipsoi, Halki or Karpathos and Kasos. The book offers a lot of tips on how to get there, where to stay or eat, which places to visit and most of the time they are very accurate. In order to get this kind of info while in Greece you have to consult a number of different travel agents or tourist offices (one for the ferries, another for air flights, a differet one for getting info on local accommodation and if you are lucky and you know somebody who has visited the island you chose, then you can get also some real tips on where to stay and what to do).
Perhaps there is too detailed a presentation of the 'monuments', some of them are not as spectacular or interesting as mentioned, however it is still useful for the interested visitor.
In sum, the book is definitely worth its value.