>> it must not be very sensitive
>> otherwise it would flag up at every corner.
I don't think that is too much of an issue. Ours certainly picked up 2-3psi drop. A rolling average of say the last 10 200 metre segments would bring cornering time nearer to the calibrated mean and would enable earlier reporting of a faster drop in pressure than a smaller one, as compared with just measuring the last kilometre. The rear wheels travel a shorter distance than the fronts on average but that will be effectively aimed off for in the calibration, which I have been told takes several kilometres after pressing the button. Perhaps if you lived in Milton Keynes, and did the calibration on the M1, it might trip it up...
The handbook warns that changing one tyre or driving with more weight on one side will trigger the warning!
Ours has so far flagged no false positives - it has only triggered once, for that modest difference in pressure.
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Vauxhall - Tyre Pressure systems 
Vauxhall - Tyre Pressure systems 
