I got my cert about 2 years ago and I personally don't care much for it. I have been teaching aerobics for 10 years and I teach everything. Certified and trained in every class out there, one exception is hip-hop, just not my thing personally! My issue with it is that the BMP's are way to fast and they want you to teach at a 140-145 BPM. I feel that is unsafe and most people have a hard time using good form at that rate. When I teach kickbox I always like to teach at a 132-135 max BPM and focus more on the movements adding in more power instead of just throwing punches all over the place. If you are new to teaching it might be ok to start with, but I would keep your money and look for a better cert. JMO. Queing is not hard, once you learn how to que IMO you use it all the time no matter what the workout. All I can really say is it depends on the instructor and your own personal goals and workout level. Everyone is different, but that is just my opinion!
Good luck!