Users appreciate WP Mail SMTP for resolving email deliverability issues in WordPress, especially with forms and WooCommerce notifications. It is praised for being easy to configure and use, providing a straightforward solution with significant free features. Many users have relied on it for years across different websites, highlighting its reliability. However, drawbacks include the forced installation of WP Forms Lite, which users find intrusive, and some concerns about the cost of the premium version. Some users faced initial setup issues, particularly with certain email providers. Despite these, the overall consensus is positive, emphasizing the plugin's effectiveness and simplicity.