Users appreciate the WordPress plugin for its ability to save time and effort, particularly after site migrations or theme changes when thumbnails must be regenerated. It is praised for being easy to install and use, providing reliable results even with a large number of images, and offering a clear visual progress indicator. Many users find it invaluable, especially for developers and designers who frequently adjust image sizes. However, some drawbacks include occasional failures to regenerate all thumbnails, compatibility issues with certain image formats like .webp, and potential problems like inadvertently deleting images or causing site downtime. The lack of updates due to the creator's passing is also a concern for ongoing maintenance and improvements.