I would respectfully disagree with a few of my fellow reviewers. This is a great way to start learning Scottish Gaelic. The audio is clear, and follows the book. The speakers might be fast, but that is how people normally talk. There is no point in the speakers talking slow, this gives you an opportunity to hear how Gaelic is really spoken. If you where to listen to slow speakers and learn to speak like that I'm sure that most native speakers would wonder why. Also you would not be able to understand native speakers, and would be asking them to speak slower or repeat themselves.
Now, I have tried to use Teach Yourself Irish which is similar is style to TY Gaelic. Both texts have dialogs followed by phrases and idioms. There is no true vocabulary lists aside from the vocabulary lists at the end of the book. That is my biggest problem with those books. I'm the type of person the needs to understand the words before understanding the idioms and such. Thus Colloquial Gaelic is on this line of thought, for after each dialog and most readings there is a vocabulary of words (not idioms!).
This might not be the best for everyone, but it works for me.