No kidding! I've got several IANTD tech cards, and I'm still not sure what they all mean. My latest one says trimix to 330', so I figure that will about cover anything I need to show a card for. But even moving through then classes, the instructor wasn't sure what was what, and even Patty Mount had difficulty giving consistent answers.
That said, I think intro to tech can be great through IANTD (Deep Diver / Advanced Nitrox combined class), if you have the right instructor. However, GUE's DIRF class is a sure winner, as should be NAUI intro to tech.
I think the OP is correct that the skills are worth it, even if you never move into any technical diving.
Rick... hope all well for you up NW!! Alan

One thing that Adv. Trimix card will not cover is when some knucklehead wants you to produce a SDI Solo Diver card in order for you to dive solo from their operation. LOL
I am gathering by your comments that you were not happy with your IANTD courses....least your last with Patty? Did you feel you got the training required at that advanced level from this instruction course.....or did you feel shorted?