This question and many others are answered in the course of the class! In short, our cells lose their elasticity as we get older. This affects our off-gassing more than our on-gassing. So, the less N2 we absorb, the better it is all around. If you're over 40, NitrOx should be a part of most every dive. It is for me!When consumption rate = NDL, why bother with EAN?
As for owning your own analyzer: I highly support that concept. I own 2 and so does Elena. You'll see ours at most every dive site we go to. BTW, they have an awesome membrane system on site.