I used CPX center in one campaign with another vendor which i was part of team from both vendors (we work together). But the support team from this cpx center has not given me any positive feedback about my account or other aspects such as affiliate's performance etc. The only thing they said we are doing too many clicks which does decrease your profit but when you do right amount like 20%, 30% then its ok! They also make suggestions if you run PPC adwords on CPC keyword than most likely their ads will show up at top right side below sponsored. CPX is a very user friendly platform that allows the user to create their own campaigns, track stats, and manage accounts. I do not have any dislikes, but I would like the ability to see more detailed data about my campaigns and the ability to have more flexibility with the CPX dashboard. I would highly recommend using CPX center! It has helped me create and manage campaigns on the fly, and is very easy to learn. I have also been able to track my ROI on campaigns.