The GRE Tutor uses sophisticated adaptive algorithms that teach you more efficiently than a human tutor can. The interface is a very simple multiple choice flashcard design and its goal is to help you learn in an interesting manner. It does this by quickly adapting to your particular strength, progress and attention at the moment. Words need to be presented with just the right frequency to reinforce your memory. The power of the tutor engine therefore becomes apparent over time. You should therefore not judge it until you have used it for 10 minutes at least.