I won't be buying anything else from them either. Their ads should say that, that you might need to shim the tool to square before they sell it to you. To say that it should come square from the factory but then not tell you that it might not is not ethical advertising in my opinion.
You are correct about the other miter gauges Don. A Fine Woodworking test claimed the JDS Accumiter to be the best. If they have an email that you can send a message to then wait until more of the members have responded and then send them a link to this thread. After they read it they might change their response to you.
Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.