Very satisfied with Copeac and theyre support. Only thing i could mention is that the interface they have is a bit messy.
Copeac has always been on of my top cpa networks. I have ranked them first on the site in my sig mainly due to the fact that they go out of their way to help their affiliates, have a good few offers, good support, pay on time every month, etc. I've only had one small issue with them which was dealt with nice and quickly.