For Waltz nothing to say with respect to studies that I found rather badly transcribed ... No particular problems for one who has the habit of choosing his own fingerings and nuances. The problem with these editions is that we can not claim a high accuracy for the nuances and fingerings, which perhaps explains the very affordable or competitive. There are some waltzes for the autograph version of Chopin, and the version of the editor of his time Fontana, enriched and final. In short these very affordable Editions should buy for Bach for apprentices pianists, because we can do without indications of measures and nuances ... But to each his own and level.