I used the service for three months. The first month and half I spent it reviewing the breath portion of the exam. It was very useful and the instructor was knowledgeable. The depth material however was not as useful as the breath. At moments the instructor was confused, which I understand, but for it to feel like the instructor is reviewing the material at the same time as they are presenting feels weird. Due to that experience I didn't take full advantage for the second half of my subscription.
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