(Sorry if it's a miss, this community looked the most fitting)
After mentioning them somewhere in comments, I actually bought Shokz after years of sitting curious. There are a few brands that do them, so it doesn't matter what's the brand is. I bought what I've heard of and the cheapest model I could find at that.
So, what's the trick? As I'm cycling, walking and running a lot, I needed a headphone solution to be aware of my surroundings. They don't cover ears and don't actually emmit sound - they vibrate and make your bones serve as a membrane.
The obvious minus is that in a bus or other loud setting you can't hear shit. That's by design. And, logically but somehow absurdly, by shutting your ear with a finger, you can make yourself hear it okay. I did a full circle here, returning to the old headphones isolation problem, heh.
But what impressed me more, they do feel like some kind of a cyberpunk prosthetic. You can wear them all day and even the cheapest one that promises 6hr of activity lasts days on the idle. But as you call someone or watch a vid – here they are, with a little to no latency. Honestly, I feel like if there'd be implants, that's one of the basic ones we can try first. It's hands-free device with a bonus of being more stealthy and not isolating you from the world.
As a cheapskate audiophile who stayed with cords for a long time, I can say that the sound is okay. Keeping in mind that producers can't control the skull of a wearer, they can't nail the ideal sound, but I'm impressed with how nice IDM and metal plays on them - something akin to budget Senh, AKG and Audiotechnica. And unlike cheap Sony, they don't put up low freqs, that's a plus. BUT when I shared it with others, people in body reported less effectiveness due to thickness of skin and under-dermal stuff, so it's better to test it if you aren't skinny as a skeleton.
After being so open about plus sides, I'm to talk minuses. Since the software is proprietary, it doesn't have many controls and is very weird sometimes. As I bought a model that was for internal chinese market originally, it talked to me in Chinese, and it can only be switched to another language before any pairing, so only after unpairing I could've chosen English – and the same combination of button presses when paired was reserved to calling the last called number, so I fucked up a lazy weekend morning for a friend of mine calling them 4-5 times, damn it. Ah, and it supports dual pairing with a PC and a smartphone, but as I tested it this function worked weird and I sometimes manually disconnected them. Walking&working distance from a source device is around the second or third room, that fits most office and home listening cases. I could've probably wished for it to have an option to pick lesser distance since I don't usually have even a meter between my smartphones and them.
Ah, and going back to the bus problem - the obvious downside that you want to turn them to 100% volume that you don't feel, but your ears do. After the first day when I needed to move a lot in loud contexts and thus put them on max, I had a headache, because although I didn't register the volume, my head had a first row concert experience. So if you use these, keep that in mind too.
Have you tried them, is there a topic I haven't covered? As you can tell, I'm happy with them, so I would be biased. It's just with VR stuff, even from Apple, I feel like we underlook existing tech that already serves us as expander of our life experiences and powers.
I asked my friends a couple of times when we had calls and some Discord conversations. No problems reported even when I was on a windy street at that time. I'm yet to see the spectrogram of their input, but I listened to my voice messages and they were fine. Obviously, not an all-purpose mic that can record music, but with a range of freqs that covers our speech it works no worse than industry standard, with airpods, dots and others. I even used it, stealthly, to record some IRL talks, just in case, and the result was clear. Their not-very-noticeable nature helps it.