2000STI7

Hi,
Has anybody any experience with the G-Trak Stealth Advanced Security System?
Details of the alarm / tracker can be found at http://www.jigsawtrading.com/index.htm it uses mobile phone technology for the tracking and they say the police can track the signal is this true? I could just call the police tell them my car has been nicked give them the mobile number and they can find the car.
It looks like a good piece of kit you can phone your car and disable it in the event of a hijack as well.

Thanks,
Paul.