I'll be getting my Nitrox cert in the next 2 weeks, in advance for my upcoming AquaCat trip this fall. I was going to dive Nitrox during the trip, due to the high number of dives we'll be doing. On the deep dives, obviously Nitrox is not an option...but my question is this: Is the $100 extra for the Nitrox worth it, or am I wasting my money?