Very helpful, the gave you a lot of good picking techniques
Usefulness is limited when you're playing a chromatic instrument
Aaron O'Rourke's flatpicking skills mark him as the most technically skilled Mountain Dulcimer player around today. The tips in this book show how he got there. Of special value is his concern for explaining not only the "what" of technique, but also the "why." The descriptions are especially useful for beginners working on building their flatpicking skills, and the numerous examples and exercises will help more advanced players hone their skills.
Aaron O'Rourke - Secrets To Successful Flatpicking
This is an excellent guide to dulcimer flatpicking. It starts at the most basic level. Each new arrangement gets progressively more complex. By the end of the book you are doing some very advanced flatpicking. Also, nice selection of favorite tunes and lesser known compositions. Instructional text is clear, concise and easy to follow. This is the best source for flatpicking instruction of which I am aware. Highly recommended.