They stay in snugly when you’re dancing, bopping, shivering. They stay in under conditions when the wired EarPods would have fallen out. In other words, here’s what most people miss: The weight and tug of the earbud cord add to the falling-out problem, rather than solving it.
So if that’s what you’re worried about, forget it.
What you do have to worry about is dropping the AirPods. They’re tiny and shiny-slick; Apple may as well have covered them with Teflon. In the three months I’ve been testing them, I’ve dropped ‘em a few times onto the floor of the commuter train or the bowels of my airplane seat, simply in the process of transferring them between their two homes: the case and your earholes. (A replacement AirPod costs $70, although of course you could always just forage in couch cushions in public places.)
Totally agree about this. After three months, I’ve never once had one fall out (your ears may vary, of course), but I have dropped them a few times.