Main advantages of Atzarin

Completely chromatic and neutral.

You can play any kind of music in any key, without having to change instruments or transpose.
Enables same execution of a piece of music in different keys.
Drastically reduces memorisation of scales, chord shapes, arpeggios etc. making learning not only how to play the instrument but also music in general easier and faster.

Most notes are found in both directions of the bellows, repeated in different rows.

It offers numerous alternatives in fingering and keystroke sequencies.
Notes that are far apart from each other in one direction of the bellows are brought closer together in the opposite direction.
Different musical keys share the same shapes of scales, chords, melodies, chord progressions, arpeggios etc. making transposing easier.
Enables much smoother, more regular bellows operation, very important for playing legatto, for example.