The range of the notes is great and the flexibility to choose the exact notes you want to drill is wonderful. There are some downsides - there are no options for drilling flats or sharps, and the microphone input will only work for instruments in the key of C (and also not guitar, as the guitar notes sound 1 octave lower than written). But for getting students started on the basics of note reading, it has been an indispensable app for me!