But I dive it anytime I'm going below 60 feet. When you increase the Oxygen from 21% as in air to 32% in the most common EANx blend, you have that much less Nitrogen in your breathing gas, therefore less Nitrogen loading, therefore about 50% more bottom time below 60 feet. There are other possible pluses, as many divers say they feel better after diving Nitrox as compared to air, but that's open to discussion.
The cons include increased prices, which vary greatly, and the small risk of Oxygen Toxidity. It's condered generally safe for divers who don't cross the conservative limits suggested in recreational Scuba, but things can go wrong.
It would not have helped me when I was new, as I was an air hog even in shallows, and not going deep, but as breathing becomes more efficient and diving gets deeper, it becomes more appealing. There's no rush for you, but I have two suggestions:
(a) When you take the AOW course, see if you can't include Nitrox training on the same dives for just a little more money; and
(b) When you buy a computer, don't even think about buying an Air Only model. You'll want Nitrox soon enough if you keep diving, or - even if you quit, the Nitrox computer will bring twice as much on resell.
Have fun, don