In reply to JayPee630:
> But surely the point is it makes it a massive deterrent to the casual and probably not so casual thief?
In some ways I would rather the thief wasn't aware the device was fitted. If they knew one was fitted, or if almost everyone had one, they would no doubt invent some method of neutralising the device. Assuming the tracker works, it should be easy to track down your bike once it's nicked.
Many vehicles like diggers and Hi-Macs now have tracker devices fitted. It would be interesting to know if these have made any difference in stolen vehicles being recovered, or act as a deterrent.