The app, which has been in the App Store for 10 years, is celebrated for its effectiveness in helping users, particularly adult learners and musicians, improve their sight-reading skills. Users appreciate the app's focus on score-based learning, which addresses common challenges faced by those returning to musical education or starting later in life, such as reading sheet music. The integration of features like microphone input allows users to practice musical notes through a familiar do-re-mi system. Overall, the longevity and sustained user base of the app suggest that it meets a vital need in music education and practice.