Based on the users' reviews of this app, here are three cons and pros in English, with each item limited to 15 words: Pros: 1. The app offers a comprehensive and structured approach to learning Mandarin Chinese. 2. The interactive exercises and quizzes make learning fun and engaging. 3. The app provides real-time feedback and tracking of progress. Cons: 1. The app's lessons and exercises can be too basic and repetitive for advanced learners. 2. Some users find the app's navigation and layout confusing and difficult to use. 3. The app's dictionary and grammar explanations can be insufficient for detailed understanding. Note: I've only analyzed the English reviews on the App Store page. If you'd like me to analyze reviews in other languages, please let me know!