The indirect sensor system? Well, I haven't yet tested it on a puncture or deliberate deflation... It occasionally triggers a warning going over a particularly rough patch of road then cancels after a minute or two..
Changed tires in July from fairly worn, cupped and very noisy tires to new ones of the same size - it flashed up a query either "New tires?" or "Snow tires?" - I forget which - and no warnings since.