There seems to be little written esperanto resources available at the current time and this is the only dictionary available. It has a useful guide to Esperanto grammar at the beginning and a phrase book at the end. Unfortunately as other reviewers have said the dictionary could do with being a lot more in depth with some common esperanto words missing (eg iri - to go). If it was a bit more comprehensive in both the dictionary and the grammar section it would be an excellent reference book for Esperantists.
This book is sadly lacking. Some of the most fundamental words are missing, and more often than not I end up resorting to the Internet to find the answers to my questions. Save your money, and check out one of the free online translation dictionaries instead.