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Despite the impractical parts (extreme stretches of the hand and how to hold the violin), and his take on Paganini which I find unconvincing, his philosophy on learning the violin is up my alley. The DVD on bowing is a bit comical as Ruggeiro is in advanced age but I'm going to utilize his approach to improving intonation. I don't think this book gets much attention so maybe its not so good?
What is interesting is that he believes single note scale practice is a waste of time because it doesn't fully develop an aural faculty necessary for complicated combinations of double stops, chords, and harmonic progressions. It is thus uninteresting finger exercises.
If you start with a chordal approach right from the beginning, the entire process of learning left hand technique is greatly speeded up and you achieve pure intonation rather than approximate intonation. This approach avoids short shifting with the thumb and fingers moving concurrently. Long practise sessions to achieve shifting mastery are eliminated.