I have a number of older security devices. Stoplock Pro, Autolock, Strongarm, Krooklock. The issue with all of them is ergonomics / convenience and storage. If it is just you in the car then the passenger footwell is ideal. But if two of you then its an over the shoulder to rear footwell job. If +kids then it is a boot inconvenience. Any incovenience is likely to deter you from using the device for short stops and if you were to be targetted you would be rally hacked off at your stupidity/laziness.