These look like a great idea in principle, but when u dig a little deeper they rely on a mesh of bluetooth networks to be able to send current location. Basically you have to be within Bluetooth range of your car, or someone with Bluetooth turned on and close to your car to trasmit current information. Perfect for lost keys in the house, not so good for a car. Therefore they get very mixed reviews for reliability and accuracy. Which is a real shame as it looks like a nice little device.
If your car has the tech pack and a sim installed you can download the Audi app and one of the features is last stored location. Its not perfect but does offer some functionality. As others have said.
Other options include picking up a cheap Sim deal and buying a cheap device from Ebay and hiding that in the car somewhere. Once again not perfect, but a cheap alternative to hard wired installations and you can manage it yourself with no extra charges other than SIM.
Trackers were one of the original and probably still the best but as others have stated, you have to factor in the purchase and subscription costs, plus would your really want your car back?
There are the opportunist and the professional thieves with cars stolen to order. If the car is stolen and placed straight into a container, you have very little chance of seeing it again. However often they are stolen and parked for a few days in a quiet location on an industrial estate to see if cars have tracking devices. If yours does ( in what ever option you choose/ use) You might be able to get your car back. If its stolen by the other type or used for another job, then you probably wouldnt want to see it.
The whole subject is an interesting area, with lots of different views up for debate. Some people think fitting flame throwers to the side of your car to stop car jacking is a great idea, some think it should be an optional extra/ fitted as standard, most would agree its a step too far, but you get the idea! Whats required to keep insurance premiums down?, How hard do you make your car to steal? How much of a fight does an individual put up if you are woken up in the night or attacked in broad daylight? If you add extra security, OBD, Physical locks ( Steering, etc) and that brings people back into your house etc for a second time, more agitated, is that a good thing or a bad thing??
Each of the above is a personal choice and the tracker option if not an insurance requirement is once again down to an individuals peace of mind.
Put on the car what you feel is right and ofcourse what ever is actually required for your personal situation.
Jungle