the problem with devises like these is people rely on them to tell you when something is getting dangerous or at least on its last legs, I have a similar issue with sally car, she needs some kind of tyre warning sensor to check her tyres, on at least two occasions (while parked at the supermarket on full lock) I have spotted that they were down to canvas at the front.
I once watched someone trying to top up there oil through the dipstick hole
but then if no one has shown you how do you know these things, agreed - but I just cant help thinking stuff like this is a false sense of security.
maybe there good as a first line of defence, or to keep a car original.