But I am wondering if this is really the thing to test: Unfortunately, this is extremely difficult, if not impossible, for us to independently test. It is a bit like looking for your lost car keys under the lamppost even though you lost them down the alley. We measured what we could measure, but that isn't what Google says is better.

Also, this does not test proper standard behavior, which is the response to a non-existing domain. And the fact that OpenDNS seems to do something goofy when you search google for things.