Users appreciate this WordPress plugin for its simplicity, ease of use, and effectiveness in integrating custom HTML, CSS, and JavaScript into their sites. It saves users time and effort, especially when their theme providers' solutions are complicated. Additionally, the support team is highly praised for being responsive and helpful. However, some users experienced issues with the latest update breaking their code, forcing them to revert to an earlier version. Despite these issues, many find it reliable and feature-rich, although minor suggestions include better handling of JS files and improving file order management. Overall, it's seen as a powerful tool essential for web designers.