I have been using MediaHub.com's self-serve platform for the last month and am very impressed with the UI layout and the ease of the features that range from retargeting to adding {zoneid} to creating lists. One of the more useful features is that I am able to optimize by sources, which has been excellent for getting the results I was hoping for. I was told that they're still upgrading and updating the platform so this could be something good for the long run! Let me know if you guys have any experience on this platform and how it's been working for you.