Let me reiterate, while everyones performance with a program will vary, Referback is an EXCELLENT casino group with fantatstic support for affiliates. They have a sterling reputation with players. I have done very well with them for years and they have outstanding retention and REALLY good player values. They also are great supporters of our community. I wouldnt have a problem recommending them to anyone.
If you dont do well with them then talk with your affiliate manager, if that doesnt help then you probably should move on, but I wouldnt give them up if at all avoidable. Player conversion may be a lower then with newer programs, but the overall player value and retention outweighs this IMO.