I agree with the previous statements about the instructor driving the quality of the course. When I teach it, I have a full power point presentation along with tool kits, work mats, and examples. The shop I work with has all the pre-made kits with the tools, a first stage, second stage, SPG, Inflator and tank valve. I go into detail about the types of first stages and second stages, the inspection of hoses, SPGs and BC Valves. I also explore the cost of rebuilding things versus replacing for inflators and the facts about damaged and unrepairable SPGs. Everyone will get to take apart all of the above to see how it works.
You will not get rated to service equipment, but my students love the hands on "this is how it works" explanation. This is a very popular class for us.