I've been using Tile tracking devices for a few years and I especially appreciate the slim one I keep in my wallet. But after watching Marques Brownlee review of Apple's new AirTag, I'm going to buy a 4-pack when they become available. They are at least a generation ahead of the Tile in features, as described by Apple here:
Each AirTag is equipped with the Apple-designed U1 chip using Ultra Wideband technology, enabling Precision Finding for iPhone 11 and iPhone 12 users. This advanced technology can more accurately determine the distance and direction to a lost AirTag when it is in range. As a user moves, Precision Finding fuses input from the camera, ARKit, accelerometer, and gyroscope, and then will guide them to AirTag using a combination of sound, haptics, and visual feedback.
If AirTag is separated from its owner and out of Bluetooth range, the Find My network can help track it down. The Find My network is approaching a billion Apple devices and can detect Bluetooth signals from a lost AirTag and relay the location back to its owner, all in the background, anonymously and privately. Users can also place AirTag into Lost Mode and be notified when it is in range or has been located by the vast Find My network. If a lost AirTag is found by someone, they can tap it using their iPhone or any NFC-capable device and be taken to a website that will display a contact phone number for the owner, if they have provided one.
I like the idea of a network of people helping each other find lost stuff. I hope someone gamifies the finding of lost stuff, a la geocaching.