I grow envious of musicians, especially violists, who played with and under Primrose's tutelage. This book was elucidating, especially for a viola performance major like myself, and I highly recommend it to violists looking for practice techniques, and pedagogical methods to improve their and others' mastery of the instrument.
Also, Primrose is witty and knowledgeable as hell, so his jokes and anecdotes keep the book very fun to read.
A professor once told me that aspiring authors and writers should read Zinnsler's "On Writing Well" once a year. I strongly believe that aspiring violists should do the same with this incredible book.