Users appreciate the WordPress SMTP2Go plugin for its effortless setup, reliable email delivery, and excellent customer support. The plugin simplifies the email configuration process, often requiring just a few minutes to generate an API key and verify settings. Users are particularly impressed with its reliability for sending transactional emails, preventing them from ending up in spam folders. The plugin's detailed reporting features and ability to track email opens and clicks are highly valued. Additionally, users commend its affordability and the generous limits on the free tier. However, a minor drawback mentioned includes the need to adjust certain settings when switching from other SMTP plugins to ensure compatibility with existing forms.