If you're interested in previewing and testing the UX of an individual ad tag, you can find this data by clicking 'View' for a given ad:

Currently, we gather performance metrics for the ad load, broken down by domain and by content type (HTML, Javascript, etc.).

You can also preview the ad in your browser (for QA/troubleshooting), view multiple frames of the ad and view an interactive network timeline to quickly spot issues:

You can also grab the link to a sharable version of the ad that takes you to our free tool, Previewads.com.

We have much more planned here (Ad QA), but let us know if you have any questions or ideas!