Personally I feel Google have been less than honest from the outset in their public pronouncements about this tool.

CC +Jim Munro might be interesting for your hangout.

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The Sad State of My Search Traffic After Disavowing 35,000 Links
On April 3, 2013 I disavowed every link to this website I could find through Google Webmaster Tools. 35,000 links. Gone. It was an experiment, documented on Moz, to better understand how Google’s Disavow Tool worked. For almost the first

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This post was first made on the Richard Hearne Google+ profile.