Based on the user reviews of BMessenger: Client for VKontakte, here are three cons and three pros, each limited to 15 words: **Cons:** 1. Notification issues: Some users experience delayed or missing notifications, causing frustration and inconvenience. 2. Crashing problems: Frequent app crashes occur, leading to data loss and disappointment among users. 3. Limited customization: Users feel that the app lacks customizability, making it difficult to personalize their experience. **Pros:** 1. User-friendly interface: Most users praise the app's easy-to-use interface, making it simple to navigate and communicate. 2. Seamless messaging: BMessenger allows for smooth and efficient messaging, with most users experiencing no lag or disruptions. 3. Faithful VKontakte replica: The app faithfully replicates the VKontakte experience, providing a familiar platform for users to connect with friends and family. Please note that these cons and pros are based on a general analysis of the user reviews and may not reflect the opinions of all users.