Man, i'm not going into length to explain it. F-that!
Polyols aren't good for you, they spike your insulin. Scientists aren't sure how they're metabolised yet and they could have risks associated with them because long term studies haven't been done. GI only really matters with regards to food that has some REAL carb content. As in carbs that your body can use as fuel. These bars are shiiiiiiiiiiiiit! Straight up.