Based on the users' reviews of the Hopper Merge app, here are three cons and pros in 15 words or less: **Cons:** 1. Many users experienced crashes and app freezing, causing frustration and lost progress. 2. Difficulty in merging clusters and unwanted merging of groups leads to mistakes and annoyance. 3. Some users complained about the app's reliance on internet connection, making it inaccessible offline. **Pros:** 1. Users praise the app's clean and intuitive design, making it easy to learn and use. 2. Many appreciate the regular updates and new features, such as improved game modes and graphics. 3. Hopper Merge's community and leaderboards encourage friendly competition and social interaction.