The chords detected by Capo are quite far from what they should be, as is the tempo and the time signature. It also ignores the fact that the tempo and the time signature can change within a song.
This makes Capo useless for anything but very basic songs, which, as an amateur musician, I can already easily play along while listening for the first time. Unfortunately, it fails to help with the more complex songs where Id appreciate some help.
So, if you intend to use this for any sort of semi-serious work beyond the simplest tunes, it is a waste of your money.
Edgerunner about Capo - Learn Music by Ear, v2.0