This is said to be the most hazardous study in thirds in the literature of the piano.

Louis Ehlert wrote: "Chopin not only versifies an exercise in thirds; he transforms it into such a work of art that in studying it one could sooner fancy himself on Parnassus than at a lesson. He deprives every passage of all mechanical appearance by promoting it to become the embodiment of a beautiful thought, which in turn finds graceful expression in its motion."

Kullak says: "Apart from a few places and some accents, the Etude is to be played almost throughout in that Chopin whisper. The right hand must play its thirds, especially the diatonic and chromatic scales, with such equality that no angularity of motion shall be noticeable where the fingers pass under or over each other. The left hand, too, must receive careful attention and special study. The chord passages and all similar ones must be executed discreetly and legatissimo. Notes with double stems must be distinguished from notes with single stems by means of stronger shadings, for they are mutually interconnected."