I'm guessing the people that give this a 5 star review haven't actually had to use it yet. After paying $80.00 for a combo pack, I tested these out to see how they work. What I found is this:
1. When the connection between the phone and the Tile is severed by going out of range, it doesn't automatically reconnect when you come back in range. For example, if I leave my keys downstairs and take my phone with me upstairs, it breaks the connection between the two and they stop communicating. If I go back downstairs with my phone, they don't automatically reconnect. This means if I come downstairs, grab my keys, drive 30 miles, go to a mall, go out to eat, and then realize at the restaurant that I don't have my keys, I will go into the app and it will say my keys were last seen at home. None of the places I have been since the connection was broken have been tracked. The only way to reconnect them is to constantly go into the app and update my location once I get somewhere. I have notified customer service via email and the fixes they have given me - such as adjusting the settings and so forth - have not fixed the problem.
2. As part of my testing, I wanted to see how the "Notify when found" feature works. I purposely went out of range to break the connection between my phone and the Tile. I then selected "Notify when found" to find my keys. I then pressed the home button on my phone but the app was running in the background. I came back to where my keys were and... no notification. After several minutes, I opened the app, the location refreshed and only then did I get a notification that my keys were found.
3. The sharing feature is confusing. Since the Tile can be used to find a phone it is connected to, I originally had my wife's Tile connected with her phone and my Tile connected to my phone. We then shared each other's Tile's so we could both see where each other's keys and phones were. The problem is that when one person goes out of range, the shared Tile automatically connects to the other device it's shared with; so if I take my phone upstairs and my wife was downstairs with her phone and her keys (where we usually leave them), my Tile would connect to her phone. It would stay connected to her phone until she then goes out of range and my Tile would relinquish the connection to her phone and reconnect to mine. But again, due to the issue described in #1, my Tile will only reconnect to my phone if I open the app to update it. We had too many issues with this and it was frustrating so we decided to have all Tiles only connected to my phone and deleted the app from my wife's phone.
4. For whatever reason, even when the connection isn't severed by going out of range, the Tile and the phone don't appear to communicate with each other constantly (as they should be). Sometimes I open the app and it says the last update was a minute ago and other times I open it and it says the last update was hours ago even though my keys and my phone have been right next to each other all day while I'm at work.
I got this due to the positive reviews. It even has stellar reviews from multiple well-known publications. I have notified customer service and have done everything they have told me to do with regard to ensuring the app is running in the background, logging out, logging back in, restarting my phone, etc. and none of it works. I've got the Bluetooth always on, I've got unlimited data with location services always on and set to high accuracy... nothing. These issues are major issues with this piece of technology that are big enough, in my opinion, to prevent it from being released for sale. I can't imagine I have a defective set given the number of other people that describe similar connection issues. At this point, I'm going to return it and would not recommend this. I have absolutely no confidence that I will be able to find anything should it get lost.