I have purchased 4 Classics, one Hyperloq NeoKey, and one Hyperloq NeoCard. I use them on keys, a wallet, as well as in my car. So far (about 1 month) they work as I would expect for such a device:

- If my iPhone is nearby or even on a street where some cars/pedestrians are passing by, it seems to work quite well and accurately shows the device's location within a few meters. I have only seen a significant deviation once and once the connection was lost, and I had to turn it off and on (both times it happened with the NeoKey - I haven't had any issues with all the others so far).
- The sound has helped me many times to quickly locate my keys instead of searching through all my pockets, bags, etc. It’s not very loud, but it does its job quietly.
- The location does not update in real-time but every few minutes, I think to avoid draining the battery quickly.

Overall, so far so good. I have never tried the original AirTag to compare, but I haven't found anything that bothers me.