And my car has none.I binned the damn things.Annoying pita imo. 
Couldn't agree more. I know some people like to have things which should work to work, but when that thing is completely useless, time to get rid IMO.
If you service and inspect your own car properly, you know how many miles you have left! 
Couldn't agree more. What's the point in having something that gives a warning for 1.) the correct reason of your pads bing low or 2.) because its a faulty sensor
cut it, tape it up out the way and check them manually every so often
Because some BMW owners bought the wrong car and don't want to get thier hands dirty or even know where the brake pads are.
Although sensors can be misleading to some people. I have a certain brother with 11 plate 530D, who thought his tyres where being pumped up, because the tyre pressure warning was displayed on the dash.

so it naturally follows that if the brake pad warning comes on.... ( Oh Sigh...)