I don't have either the Aeon or the Aeon 2, but the thing about open headphones is that there are a lot of good ones. I personally have at least half a dozen pairs that are near enough to perfect that I can choose among them based solely on size, weight, and comfort (e.g. which ones will I take on a trip). It's seems to be much easier to find a decent pair of open headphones. I'd say that most people, if they know what they're looking for, can find their "end game" open headphones for under $200, i.e. good enough equipment that no matter how much more they spent, they couldn't tell a difference in a blind A/B test.
But finding a closed pair of headphones that is (1) lightweight (2) comfortable (3) non-leaky and (4)
has audio quality comparable to good open headphones? That is a much harder thing to achieve, it seems. It's why I haven't bothered looking for any new closed headphones after finding the (pre-Monoprice) Ether C Flow ... they're just that good. So most people have already found their perfect open headphones, and now their spouse is complaining about the noise leaking, and they need to find a comparable closed headphone and ... crap, it's hard.
On the other hand, if you really want a bass monster, then finding a fun closed headphone (like the Monoprice M1060C, which I picked up for a song, and which I love for bass) is pretty easy
and the same is
not true for open headphones.