helps student understand!
The advantage to the whole "don't fret", as opposed to the "first frets", for ME as a teacher is that it gets the students, 1) to understand that there is a difference between whole & half steps, and 2) they ask about the white lines then I show them, relating to keyboard. I always have my students draw the finger positions on a scale chart form anyway, which has all the "fingerprints" on it (I designed it), and for beginners I draw a colored line to match the colored frets.
Since I don't take students younger than about 8, I can see that teachers of younger ones, esp those w/ no piano knowledge, might prefer the "first frets" version. So I'm glad they make both types.
Eventually the students learn to find the notes by ear, but esp if they are playing in school groups (where they really can't hear themselves well and not everyone is playing in tune - ! - ) this tool is wonderful for helping the student gain some self confidence that they are doing it "right".
A bit time-consuming to apply, but not that difficult if you follow their instructions. And well worth the effort!