I have pretty narrow ear canals, so I can’t really wear airpods without fear of them flying out while biking. The ear hook design solves that. I misplaced a pair of KZ AZ09s on holiday this summer, but I’ve since replaced them with a set of Fiio UTWS3.
I have nothing but good things to say. The weight of the Bluetooth hooks negligible, especially because the majority of the weight is resting on your ears. I hardly feel them when I’m use (besides the feeling of the actual IEMs in my ears), and having a button on each ear is really convenient.
The case is on the big side, but it fits well enough in my pockets to not be that big of a deal. The battery in the units are big enough to last for ages, and the battery in the case being an actual big battery means I charge them once a month, at most.