User testing is going to be difficult, since we don't currently have all of MaxMind's data files available to the Beta Cluster, or even in production. To make up for this, we should be rigorous with our unit test coverage.
This task is for ensuring that our unit tests cover our usage of the geoip2 Reader API and the Model classes' APIs (e.g. City.php, Asn.php, etc). This may involve refactoring GeoIp2InfoRetriever.
We may also be able to make use of Maxmind's test databases for integration tests.