I was initially hesitant to weigh in on this but since I appear to be one of the few people having seen these tapes thought I would share my opinion.

DS was given this as a gift for his first bday, interestingly enough the gift giver thought we would be particularly appreciative of this present because of the work they perceived us to have done with GT DS4. We are not big fans of TV for kids, especially at that age but I did recently watch the first tape. Outside of the way these tapes are marketed I see no difference in this and say Baby Einstein.

While I don't doubt these tapes work if watched enough, i agree with others that it only helps children memorize sight words. The developers daughter could also be GT therefore accentuating her abilities.