tracker is about as good as a choclate tea cup...
Oh really . . . If you are talking about any old tracking device, maybe, but the "proper" Trackers are actually approved by all 52 UK Police forces, AND, they also have Thatcham approval . . . and . . . I could go on, but some people just can't hear valid opinions from others!
these days, for a hefty sum, you can buy a tracker blocker that blocks any kind of signal behind send around it inc mobile phones signals
Care to quote your sources for these "blockers". You are aware that the latest Tracker actually uses three completely separate active tracking technologies, and a fourth passive technology. Two of those technologies have never actually been blocked, which is exactly why it has Thatcham approval.
At the end of the day, if there are scrotes who are such low life, and so determined to take your P&J at all costs, let em have you motor. Tracker has never claimed to be absolutely "bomb proof" (a figure of speach

), and they have never claimed an exact 100% recovery record, but their recovery record
IS mighty and impressively close to 100%!
No security product is completely safe, all have weaknesses somewhere, but the official "Tracker" is a proven product from a proven company!