Conroy's Breton Dict. and Phrasebk. contains a fair amount of useful information, but it can be hard to find. For starters, it would be helpful if the phrasebook and grammar sections were either indexed or broken out in the contents. Instead, one is left to flip through the book if seeking information about, eg, numbers, verb conjugations or greetings. And the dictionary section is woefully incomplete, often omitting words that are covered in the non-indexed phrasebook section.
On the plus side, the sections on question words is full of good examples and the phrasebook - once you've found the desired section - contains far more of the sort of phrases you might need than show up in most phrase books.
If you're looking for a good Breton dictionary, particularly for translating, this isn't it. It is, however, a nice book to thumb through while working to expand your range of conversation in Breton.