The platform was difficult to navigate - too many menus, too many reporting options
Negative user comments of ads 'popping out' / 'taking over' the browser
the customer service was poor at times, and not very understanding of our specific site and issues.
The ad unit appears in a wrapper, which is not the most appealing visually
Not being able to run one campaign with multiple ad units in the zedo platform, without needing to assign an impressions goal to each ad unit (not ideal if a campaign runs multiple creative swaps)
Look for alternatives, there may be some out there. Personally I feel the consumer is tired of ad units that pop out, popunder, scroll into the screen. You may see good View Rates and CTR but at the cost of negative user feedback