Personally I use it for popular songs and it tends to measure up, some hearing correction and you already have the chords.
For more complex songs like jazz or bossa I consider it less effective, but in general it is a great advance for musicians.

Another program like the ones that have been discussed here is mychord


https://www.youtube.com/watch?v=x8AYWkt2DIA


To the one who gets up early, nobody makes him breakfast.