Here, in israel, we have something else. The original "discover scuba" is not practised here at all. We have here what is called "Introductory Dives" (dont mix it with introduction to scuba), or "Intros". An into dive is a dive where an Instructor takes ONE person at a time to an underwater tour, limited to 6 meters deep. The person that comes to the dive recives a short briefing that the main part of it is explaining the issue of equalizing pressures. The person dosent have to know anything about the equpment, as it is all operated by the instructor. I took several hundreds of "Intro" dives, sometimes with kids as young as 5 or 4 years old and sometimes people above 70. It's a lot of fun, seeing the way they react to it. We have a site called "the caves" in eilat, a site that is about 4 meters deep (bottom) and has a small cavern, few meters long filled with a lot of fish, and it's really great for that purpose.
I dont know what exactly "discover scuba" is, but if it's anything like that it's worth a try for someone that thinks about doing a course but is not sure.