I understand that it is not an offical study guide but I was curious if there was anyone out there who made rank after using it.

I made 2nd but it has been a few years since that time.

Yes.

Listened to the old audio cassettes while I drove to/from work a couple of months before each exam.

Later got the CD that asked questions and you had to select an answer.

Picked up Chief a few years after I started using it.