To me these seem pretty stupid. Major features (to me) of ear-buds with wires and 3.5" jack are: 1) being attached with wires means I don't easily lose them when they slip out of my ear/hand/pocket. 2) the 3.5" jack actually keeps them pretty solidly attached to my phone (again, less risk of losing them). Walking around with two loose tiny objects seems less than ideal - at least to me; I'd lose them within days.
Can't speak about 1). Can't speak about 2) either; but HNers told me Apple did extensive testing to ensure pods would not fall while being in your ears (the physics hints that earplugs fall mainly because of wires). Still 1) is a good question. I thought they came with a tiny casket, so they wouldn't fall out of your pocket like that. Still subtle when you remove them from your skull.
I'm not sure what I expect with regard to staying in ears, though. They appear to be closely modeled on the wired EarPods, which in my experience don't reliably stay in the ear on their own, to the point where they are best worn with the cable wound around the crease of the pinna - both for strain relief, and so that they're easier to recover and less likely to be damaged when they do inevitably pop out.
