We use MaxMind too and it really does block almost all Fraud orders - there are occasional false positives but that's not too difficult to deal with as the customer normally gets in touch (it normally happens when someone is away from home and place the order, and the distance is too large). And with WHMCS you can manually check orders as well.

Since using MaxMind a couple of years ago, I can probably count the number of chargebacks on one hand.