This book is supposed to help avoid cliches and repetition. A wonderful idea--how many times have you wished to find a different way to say the same old phrase? Unfortunately, Roget's Thesaurus of Phrases isn't very helpful.
The phrases listed are, for the most part, not phrases I have difficulty replacing. Honestly--"microwave oven"? "space being"? "business school"? More phrases like "bury the hatchet" or "writing on the wall" would have been better choices. Moreover, many phrases one might wish to find synonyms for, such as "take to heart" or "throw something in another's face", were not included. In fact, the percentage of genuinely overused phrases is really quite small.
The word "phrase" is somewhat misleading as far as this book is concerned. Most of the phrases included are limited to two-word combinations, and a number of entries are merely hyphenated words. Even "e-mail" is included! In addition (another phrase that is not included), the "synonyms" vary greatly in quality and are often not really synonyms at all. For example, under "Romance language", the following words are included: French, Italian, Latin, Portuguese, and Spanish. Yes, these are Romance languages, but they are not synonyms for the phrase "Romance language". "First draft" and "diamond in the rough" are rarely used in synonymous ways. And isn't "diamond in the rough" itself an overused phrase?
Another problem with the book is its layout. Unless you're thinking of the same phrase that the author used as an entry, you'll never find what you're looking for. Many of the words used in the listing are not also used as entry words. You have to think of the right entry word to even look for other possibilities!
The only valuable segment of the book is the addendum, Phrase Maker, and even it is limited. This section lists a number of nouns that can be used with two or more adjectives that follow. It would be a handy reference if the rest of the book merited purchase. As it is, you're better off with a good, solid standard thesaurus, one that includes synonymous phrases.