I love this little item, my teacher was a bit sceptical to the idea of it, saying that sometimes they dont match up to the notes played but this has been working perfectly and in tune.
It looks perfectly OK as the plastic is seethrough, so just the colored lines are visible.
protip : the side's of the plastic loosened quite easily so i cut off the sides,(along the black lines) so that its attached only to the top of the neck.
I have not removed it yet so i can not say anything on the removal of it, but it doesnt seem "too" sticky. It didnt feel like tape or any strong adhesive, but also doesnt move around after applying it.