Users appreciate the All-in-One WP Migration plugin for its ease of use, reliability, and effective functionality in migrating and backing up WordPress sites, even larger ones. The plugin's interface simplifies complex processes, making it accessible to users with minimal technical expertise. Additionally, the plugin's capability to bypass upload size limits by importing data in chunks is highly valued. However, the free version has significant limitations, namely restrictive file size limits for imports, which many users find frustrating and deceptive. Users feel they are forced to upgrade to the paid version for basic functionality. Despite some issues with customer support and performance on larger sites, the overall sentiment is positive for those who opt for premium features.