There is a strong cultural mismatch between the two organisations, and until its bedded down there is no knowing which one will be on top.
I’ve been burnt by CPAYS within the last year (to answer the question) and despite wasting tens of hours with various people and their admiting that I was owed money I haven’t been paid.
I think the teams at William Hill Online and Webroute Services people are honest but CPAYS is an issue. CPAYS boiler room tactics also create affiliate liability issues as they are most likely to be non compliant with the Gambling Commission guidelines.
I want to work with William Hill Online but feel that until they make sure that all owed commissions are paid by CPAYS (even if this pre-dates the merger) then there will be a sneaking suspicion about who is really calling the shots here.