Almost perfect system. It took about 4 hrs to watch the videos and do unit quizzes. Took 15 minutes to write the open book test that they allow 75 minutes for. Did not have the book but still got 100%. Found my new knowledge on buoys super useful on my 500 km trip through the great lakes that started the next day. Some would say perfect learning system. Well, almost. Only complaint is that they don't tell you which questions you get wrong on the 5 unit quizzes. So no way to ensure that you learn the missed elements. I got between 80 and 100% on the unit quizzes but did not have any idea of which questions I had wrong going into the final test. I guess I just got lucky and they did not ask the ones I got wrong. But I would likely be a more knowledgeable and safer boater, if I could have learned the correct answers to the missed questions. If not for this one issue, I would have scored this review Very Good and 10.