I don't think that tablet computers should become a primary way students learn in class it's easier for kids to pretend to do their work on a computer than it is with a textbook.
It depends on the grade you are in, if you are a college student and a computer science or an IT student or any other field, then tablets and laptop is useful to create letters and reports, make videos for presentation. But if you are an elementary or a high school student, as long as it needs to be used, it is okay unless it is not required.