Hmmmm Having had to complete dives for my Nitrox card... I'm not sure of the value of the dives on Nitrox. Really, they are like any other dive... (perhaps that's the point...) I don't see a need for the dives, but I'd still rather have an instructor I speak with instead of thinking I can get the information I need straight from a text. In my class, while not the best instruction I can imagine, we did discuss a number of items that wouldn't have fallen specifically into a text... Given that diving isn't really a cheap sport... and diving Nitrox seriously isn't cheap.... I'll not worry about a few dollars for the value added of a personal instructor.