How do we know this is better than Quantcast? Does anyone know where the data comes from? Also, it seems to be missing some of the features. People suspect it'

How do we know this is better than Quantcast? Does anyone know where the data comes from? Also, it seems to be missing some of the features. People suspect it's coming from the Google Toolbar, but all Google wants to confirm is that it's some sort of "secret sauce": http://www.techcrunch.com/2008/06/24/is-google-ad-planner-getting-its-data-from-the-google-toolbar/ http://www.techcrunch.com/2008/06/24/is-google-ad-planner-ge...