Users appreciate the SAR Friendly SMTP plugin for its simplicity, minimal size, and efficiency in sending emails via SMTP without unnecessary features or advertisements. It's praised for its easy setup, effective performance, and compatibility with tools like Gravity Forms and Divi Builder Contact form. Users value its straightforward configuration, debugging tools, and the ability to add settings in the wp-config.php file, making it suitable for multisite installations. However, some users have expressed concerns about its functionality in multisite environments and the added top-level item in the admin menu. There are a few instances where it failed to deliver emails or did not respect override "FROM" values.