I am not yet using your plugin, as I found another one first and am evaluating it at the moment. Reading your change log, I noticed that you've moved away from using the freeware GEO database in favour of your own service.
Does this mean your plugin does not load a localized database onto my system and instead does a call to your own database?
If yes, I wonder if you've considered a new feature: use a log of the IP address verification requests to build a list of "suspect" IP addresses (i.e. addresses that seem to be probing a large number of client sites). With this information, you could tailor some IP blacklist settings in addition to merely checking for specific countries. Let me know if this is feasible, as it would influence me to use your plugin instead of the other.