First of all, Lumos is all it's advertised to be and quite unique. It is certainly a 5 star gimmick
for its ability to be used it in the mouth, but I gave it 4 because the instructions on where to
place it effectively potentially put it in a spot that, at least in my case, trigger a gag reflex.
Having said that, I have practiced placing it into different positions and can make it work just
fine without feeling like it may slip down my throat. (Sorry for the graphic explanation.) In all
other respects, it's a fantastic gimmick and comes as a big surprise when incorporated into a
routine.