But, then again, it may work just as expected.
The point made by GM is that the results may vary by user-specific local settings and user-specific ways in which the search engines are accessed.
I have "user preference filtering" disabled in my systems, evidently GM does not.
This isn't the first time he has drawn our attention to this subject and his point that there might be "local" variations in the results remains true.
Here is one place to get started (for the published choices):
http://support.google.com/websearch/...n&answer=35892