Many years as a user only of neckband headphones, having gone through all brands looking for the ideal combination of sound, battery life, connectivity, microphone quality in voice calls, comfort when wearing them, etc., with my latest headphones (the one plus bullets Z) I have only had them for a short time, so it is a bit early for a review. I have worked with them quite a bit now and have a better opinion. Their positives are indeed:

1) Build quality
2) Sound
3) Microphone quality - NOT - VERY BAD
4) General sturdiness
5) Fast charging

and I won't dwell too much on these as they have been discussed more or less.

The negatives are

1) Battery - it is quite worse than all the other neckband headphones I have gotten, even though they claim 24 hours of music with anc off! I had them with awareness mode or anc on, but during the day they didn't last, using them only for calls. - I will return with use without anc or awareness, which I probably mistakenly had on. IT CONTINUES TO BE BAD
2) Speed of connection to the phone and switching devices. Because the battery drains quickly if the headphones are constantly open, you have them stuck together with their magnets. From the moment you detach them until they connect, it takes about 6 seconds, and another 3 from that moment until you can speak on the phone. All my previous headphones were much faster in this area. Annoying when the phone rings, especially since within 3 seconds from the moment they connect until the sound reaches your ear, your caller cannot hear you. Similarly, there is a very long delay in changing device selection, which sometimes works with a double click and sometimes doesn't.
3) Charging, they have a built-in USB C male plug, which is okay, it is the future, but the reality is that it did not suit me at all because most of my plugs are USB A, so I had to carry their specific cable with me because only my car and laptop have USB C natively. My phones cannot charge devices. Also, you cannot continue talking while they are charging. So you have downtime then, limited as they charge quickly but you don't have headphones.
4) Handling, they have very limited handling capabilities. Volume up, volume down, play, pause, and then with a double tap on the left headphone, you can select anc on/off and awareness and switch devices. You don't have voice calls, access to any assistant, it doesn't tell you who is calling when you receive a call, in general, they are absolutely necessary in terms of application - you can't even find them, for example, if you put them somewhere on the couch.
5) Proprietary silicone earbuds that come out very easily. Mine came out of one earbud on the first day, hugging my child, and got lost, resulting in the medium buds that fit me no longer being there, and I don't give 15 euros for a replacement set when with 15 euros you get a whole set of earbuds from another brand. I SIMPLY USED ROUND SILICONE earbuds which surprisingly stay perfectly on the headphones and do not bother during use.
6) While at first I thought the microphones were good - and they are indeed good for use in quiet places, in noisy places, cars, roads, etc., they completely collapse. It must be the worst or second worst headphones I've ever had for phone use to the point where I'm asked to speak slower and also lower because they get clogged while also picking up a lot of environmental noise.
7) very high latency - you can't really watch videos.

In conclusion, after more use, I ended up using the Bluetooth of the same car and when I'm walking on the road I just tell them to be patient. Very expensive for nothing, they only work for music but there are other solutions that don't require compromise everywhere. The "problem" is that they look very high quality so I don't think they will break quickly so I will marry them until they play....