Maxmind's database is 1) huge in filesize 2) not as extensive as some 3rd parties (like Google, Yahoo, and Bing), and 3) updated monthly which adds another task

Maxmind's database is 1) huge in filesize 2) not as extensive as some 3rd parties (like Google, Yahoo, and Bing), and 3) updated monthly which adds another task to your workflow. Given that the example use is to track where clicks are coming from, those three sound like dealbreakers.