The service has been reliable, easy-to use for our agency partners as well (and us).
It's also very intuitive - no training required! We've had some issues with their support team in terms of resolving problems quickly but they are working hard at it now so I'm hopeful that this will improve over time. For most clients we have used them solely because there was nothing else out here doing what flymobi does; however if you're looking into other options then do your research first before going ahead using these guys just yet :) Our main problem solved by flying mobi ads were getting more impressions from users who weren't interested or clicking through onto websites when served an interstitial advert which would often cause annoyance/complaints / negative feedback etc., This stopped happening after switching providers.