I know it is. I was told by several mechanics who have been in the trade for, more or less, 20 years each to take it before I sit for Local 10. I didnt ask questions, I just did it and it definitely helped out in my interview when I handed them the certificate. The reason is, take as many of these small classes and get the certs because each one add points to your interview. I handed it to the interviewer and said, "im not sure if this will help." and he replied, "it certainly will".
Hog, I am trying to pass on stuff that was recommended to me by people who have been in this trade for quite some time.