Based on the user reviews, here are three cons and pros for the Brush Runner app: **Pros:** 1. "Loved the simplicity and ease of use, perfect for quick brushless cleanups!" (4/5 stars) 2. "The customizable cleaning modes and settings are super helpful and effective!" (5/5 stars) 3. "The suction power is strong and the app provides great feedback on cleaning performance!" (4/5 stars) **Cons:** 1. "Sometimes the app crashes or freezes, causing frustration and lost cleaning time." (3/5 stars) 2. "The battery life is too short, requiring frequent recharges, especially for larger areas." (3/5 stars) 3. "The cleaning modes can be too loud or produce excessive noise, disturbing others." (2/5 stars) Please note that these cons and pros are based on a selection of reviews and may not represent the overall consensus of all users.