I have used this extension on my site. The installation instructions were clear and very helpful, I had it installed without any pain.
After the installation, the setup process was also very well documented, I setup the login for Facebook without any issue.
The only problem I have is that, when I try login using Facebook, the login pop-up window have some compatibility issue with Facebook, in detail, the login pop-up window doesn't size (or resize) correctly, resulting in the sign-in page cannot be fully displayed, and user had to manually resize the window
But overall, I would highly recommend this extension, and wish Mageplaza to continue testing and maintaining it to prevent future compatibility issues.