You'll pay $14/tank for EAN32 in Cozumel and really the only benefit is shorter surface intervals. Sure you get longer NDL times underwater, but it doesn't breathe any differently and if you breathe down an AL80 of air in say 45 minutes, you're going to breathe that EAN32 tank down just as quickly. Some people say it makes you feel less tired after a dive and that may be true if you're doing lots of dives over a few days. But diving it for your typical two-tank dive in the Caribbean you really won't notice any difference. Pretty much a placebo effect really. I've dove it a few times and I don't feel any better/worse after my dives.