Congrats on the launch, your sites look very nice.
You should swing by the NATS 4.1 webinar tomorrow (
https://www3.gotomeeting.com/register/803341758) and learn about some of the great new features in 4.1. Running a NATS program next to your CCBill program (for the same sites) will allow you to make all affiliates happy regardless of their preference and allow you to see first hand the benefits that the additional tools & reporting in NATS bring.