Users appreciate the ability of the plugin to add custom HTML, CSS, and JavaScript to specific pages or globally across their sites. They value the extensive features, including the generation of shortcodes and easy customization with conditional script addition and custom classes. Many users find it essential for quickly implementing page-specific changes without affecting other pages, and the ease of installation and use is frequently praised. However, drawbacks include issues with AMP compatibility, the inability to handle non-JavaScript script types due to hardcoded script tags, and occasional lack of support and updates, with some users reporting problems in multi-site installations and compatibility issues with other plugins.