Users appreciate the Rublon WordPress plugin for its straightforward setup, effective two-factor authentication, and added security against brute force attacks. It's particularly praised for its user-friendly interface, responsive customer support, and reliable performance, especially on high-speed internet connections. However, significant drawbacks include issues with error codes, frequent lockouts, and problems with multi-user support. Users are also frustrated by the plugin's freemium model, which limits functionality to one user without a paid upgrade, and the intrusive upgrade prompts. Some users also reported privacy concerns and issues with verification emails. Overall, Rublon is seen as a robust security measure but with notable limitations and costs.