IMO, it depends on what kind of advertising companies you join. For example, I have joined in two advertising agents as a publisher. The first one used pop-up ads and gave me the bad experience. There was no technical support to me and lots of pop up from my webpage. And now, I join one popin Ads website. I’m impressed with popin Ads me so much. Not only do they reply me immediately when I have questions, but I can choose one move from 4 different directions. This can minimize the annoyance to my visitors. As a publisher, I feel popin Ads is better than other technologies (like pop in and pop under).