Users appreciate W3 Total Cache for its significant impact on improving website speed and performance. They highlight its comprehensive caching options, including page caching, browser caching, and integration with Content Delivery Networks (CDNs), which altogether enhance load times and user experience. The plugin is praised for being user-friendly, even for those who are not technically inclined, and for having excellent customer support. However, there are drawbacks. Some users faced difficulties reaching customer service promptly. The plugin's complexity can be overwhelming, needing careful setup to avoid issues like site crashes or conflicts with other plugins. Post-uninstallation issues, such as lingering autoload data affecting site health, also frustrate some users.