This is a great magic trick that has an odd logic too it. Google is always being refined and having new features added, so why shouldn't it be able to do magic tricks?
Very easy to use interface and the convincer is that your volunteer types the question into the search box. Since real Google search results are brought up, this should be a real baffler.
A minor quibble is that the fake Google screen doesn't quite resemble the current iPhone version; hopefully, Alan will update that soon. But I don't think it's a deal breaker, since your volunteer will be focused on typing the question. You should be careful about doing this for kids, since some of the search results may not be kid-friendly. At least make sure a kid doesn't click on an inappropriate link!
While I do use my iPhone in professional performances, I think this trick is best suited for informal situations. But think of the fun you can have, and the wonder you can create, when you tell your friends about the latest enhancement to Google! Great job, Alan!