Just to add to what many folks have posted already: these are delightful truly wireless IEMs. They sound great, the ANC works well enough to muffle lots of distracting ambient noise, and they connect quickly and reliably (over a few days of testing so far). For those familiar with their over-ear big brothers, the frequency response of these guys is a lot more neutral out of the box. I've also found the fit with the stock silicone tips to be fairly snug and comfortable enough.
That said, in my experience the ANC is not on the level of the over-ear XM3s, which is understandable. It's still great for listening to music and podcasts during a busy commute, which is a hell of a lot more than I can say about my AirPods (seriously, how do people listen to these when out and about?) or my Xelentos. I'm very pleased with the sound quality out of these, too. It's fun and engaging without being muddy or bass heavy, and when combined with ANC, it lets me escape into my music no matter how busy and noisy the world gets. Folks wanting to compare only to the sound quality of these to other mid-range wired IEMs may end up disappointed, but for me, the magic of these is that they're effectively super-small over-ear XM3s.
The only real complaints I have that I haven't seen mentioned yet are that the voice prompts are too loud (I know I can turn them off, but still), and that these create a slight 'thumping' sound in my ear when I walk quickly. I'm going to experiment with other tips this weekend to see if I can attenuate the second point.