From what I have seen, it is pretty reliable.
BUT
For added comfort, I wanted something I could use and track the bum myself.
Enter...On-Board Communications. The reciever/transponder is about $250. It has a backup battery and also runs/charges off of your 12v system. It uses cellular based tech.
Then you buy a bucket of pings. Send a message is 1 ping and a receipt of message is another. You buy a bucket of 400 for $40 per year.
It tracks:
On/Off
Idle time
Speed
Location
How long at location
Maps location
Uses a Geo-Grid so if it leaves a 300 foot circle (can also be set for greater distances) - you know about it.
E-mails you on status
Disables starter or fuel pump at your whim - can also turn it back on
Has a motion sensor
Has a stolen mode
Live support with real time tracking
Internal battery status
All kinds of neat stuff. We have it on about 12 pieces of heavy equipment.
12720 Hillcrest Road, Suite 300, Dallas, TX 75230 • Phone: 214-346-0300 • Fax: 214-346-0361
It will also alert you when you need oil changes, or any kind of service.
It will tell you when your kid goes over 55 mph.