Good however you can only find things using the app on your phone. You can't use the browser version to find the tags. I know this is a google limitation, but I think you should at least mention it on the product page.
I thought the find my device network would be more effective than using the TILE network, however I've found I only ever get location updates when my own phone is in the vicinity of the Chipolo point. This makes it virtually useless for my purposes.
It does what says on the box. It's a tracker. It tracks your things. The only things I'd change is that I'd like the card's battery to be user replaceable and that I'd like there to be a function to click the trackers to make the phone beep. I'm aware the latter one is Google's thought, not Chipolo's.