> relatively affordable
You can buy 4 third-party trackers for the price of 1 official one.
They do lack UWB, though there are other great form factors such as cards, and cool features such as wireless charging or usb-c charging, which imo is nicer than swapping batteries every few months.
i thought so too, but in practice i've been getting much better battery life from the official airtag on my keychain, than i do from the "atuvos" trackers that see much less use. high-precision UWB finding and half as many coin cells used makes the airtag an easy choice over the cheaper trackers for me.
the card-shaped one i've got in my wallet isn't going to be replaced by an official airtag any time soon though, that form factor is too nice.
The reliability of the other brands are quite poor though. I've tried Tile, I've tried Pebble (using Google's network) and neither has worked reliability enough. So I ended up switching to AirTags and so far I have been impressed with the reliability - it works 100% of the time which is not something I could say about Tile nor Pebble/Google.
Do they plug into the Find My network that iOS devices use?
I have a third-party tracker and the AirTag in my bicycle. The third-party tracker has no clue what it’s doing or meant to do. But then again, the AirTag is completely inaudible in a decently-sized bicycle parking garage.