I've been working with the guys from C3PA for a year now. The affiliate is normal, with its own + and -, there was no such thing that I was not paid. They have a good set of Tier1, Tier2 and Tier2 geo-affiliates. At this affiliate there is a good set of offers for geo Tier1 and Tier2, and they help in optimization, so that by ROI% I go to the top. From minuses, sometimes approve of traffic didn't come for a long time, but in general it is not critical.