Users generally like the Clean Image Filenames plugin for its simplicity and efficiency in handling filenames with diacritics and special characters, especially useful for languages like German, Danish, and Portuguese. It saves time and simplifies the image upload process, ensuring filenames are suitable for server environments and compatible with migration and backup tools. Users appreciate that it respects file titles while modifying filenames, aiding in smooth server transitions. However, drawbacks include criticism about the lack of integration into WordPress core and the absence of a settings page for easier customization. Some users reported it as a "bogus plugin," indicating potential inconsistencies in performance or user expectations.