Really takes advantage of the enhanced books features so that vocabulary shows video instead of just drawings and you can have multiple choice quizzes at the end of lessons to make a great learning tool for ASL. As always Vicars material is excellent. They are improving the book and you will get updates for free. A glitch or two can be found, but overall, great experience that will get better so I am giving all stars. I bought to encourage him to make more material in this format that is great to have on the iPad.