Tracking solutions for cars

Hi guys,

did anyone try one of these tracking devices for a car ? :

Tile (https://www.thetileapp.com/)
Tintag (http://igg.me/at/tintag)
Trackr Bravo (https://www.indiegogo.com/projects/trackr-bravo-the-thinnest-item-tracking-device-ever/)

I`m interested in buying one and I'm curious if they actually work.

Thanks