Based on the users' reviews of the Letter Run app, here are three cons and pros: **Cons:** 1. "Disappointing experience with frequent crashes and slow response time." 2. "Too many ads, making the game frustrating and annoying." 3. "Limited customization options for characters and tracks." **Pros:** 1. "Simple yet addictive gameplay makes it hard to put the app down." 2. "The app is easy to learn, and the controls are intuitive." 3. "Unique concept and design make it stand out from other running games." Please note that the reviews are from various sources, and my conclusion is a summary of the common sentiments expressed by users.