 Matanya Ophee states that in Coste's revised and augmented version, there is an introduction which is helpful in better understanding Sor, and some of the circumstances under which Sor wrote the original method.Brian Jeffery controversially regards Coste's version somewhat negatively ("travesty of the original ... bears little resemblance to the original"), even though the title immediately makes it clear, that it is not the original, but was adapted and augmented by Coste (augmented incidentally, with numerous pieces of high quality).Today Coste's version is highly regarded in its own right (the title mentioning of Sor, possibly being more a sign of respect, than what Jeffery has termed "a disservice to his friend's memory").