There is no denying that this dictionary is a helpful aid for translating Homer.
However, it must be pointed out that it is no better than the Greek Lexicon, though, it is undoubtedly a cheaper option. The only two advantages that it has over the Lexicon are its sole focus on Homeric words (but rendering it USELESS FOR TRANSLATING OTHER TYPES OF GREEK), and its use of pictures to illustrate certain words (even though the internet could supply more detailed pictures).
MY ADVICE would therefore be to get the Lexicon - you can use it for everything! - or to refer to the Perseus digital library website, where you will find a free online interactive greek dictionary. The Homeric Dictionary is a a waste of money, unless you are a beginner or average student that wishes to focus on translating Homer, undisturbed by the modern world and the internet!