I like that its killer feature is machine learning and that the questions are similar to the test questions.

The AlphaPrep exam engine provided personalized exams that challenged me as I grew stronger with the CCNA 200-301 material. When I answered a question incorrectly, the explanation and/or video tutorial did an excellent job explaining what the correct answer was and why.

Alphaprep does a great job of showing you areas you are weak in and giving you a good overall view of how you're doing with the topics. For example I was able to see that I struggled with IPv6 so I went back to study the material and then did some quizzes on IPv6, selecting only the hardest questions. This meant when I got and IPv6 question in the real exam I was confident.