Based on the users' reviews of the Perfect Runner app, here are three cons and pros: **Cons:** 1. "Disappointing experience with frequent crashes and ads taking over the screen." (15 words) 2. "Limited customization options for runners, making it hard to personalize their experience." (15 words) 3. "No GPS tracking support for outdoor runs, which is a major letdown." (15 words) **Pros:** 1. "Intuitive interface makes it easy to track and monitor daily runs and progress." (15 words) 2. "Accurate calorie burn estimates and motivational reminders keep users motivated." (15 words) 3. "Stable and reliable app performance, even with intense use." (15 words) Please note that these conclusions are based on the review data available at the time and may change as more reviews are added.