This product does not have much to shout about as it tastes very similar to ordinary granola/muesli. I did not particularly like that some of the oats were very gritty and powdery, which made the milk that I normally accompany it with to be slightly unpleasant as sometimes the tiniest of bugs would get inside my drink. The raisins are most often times shrivelled and dry which forces me to pluck them out by hand one by one and soak some of my own bought raisins for at least half an hour instead. As for the said prebiotic part, I do not taste any difference from this product. Nothing is fermented among the list of ingredients and the taste is plain and boring after a while. However, a fast alternative to conventional sugary cereal, I guess.