Based on the users' reviews of the Live Quartet app, here are three cons and pros in English, limited to 15 words each: **Cons:** 1. Some users find the app buggy and crashes frequently, causing frustration. 2. Users have reported difficulty in customizing settings and navigating the app. 3. A few reviewers have experienced poor video quality, including lag and distortion. **Pros:** 1. Users praise the app's ease of use and intuitive interface, making it user-friendly. 2. Many reviewers appreciate the app's ability to connect them with others sharing their interests. 3. Users have enjoyed the app's ability to enable real-time conversations and live events. Please note that these conclusions are based on a review of the app's user reviews and may not reflect the entire range of opinions on the app.