 Frederick Neumann remarks that it "varies greatly in dependability, with some volumes remarkably trustworthy, others far less so".Alfred Einstein expressed dissatisfaction with its presentation of Mozart's "Coronation" Concerto and "Marriage of Figaro", and Friedrich Blume was particularly severe on what he called the "astonishing frivolity and often complete irresponsibility" of the editors of this edition (specifically with regard to the handling of Mozart's piano concertos), asserting that "the "Collected Edition" [i.e., the AMA] of Mozart's works and the practical editions based on it offer no more than the skeleton of his compositions.