They either never work, or stay on too long, when cars are negotiating a Roundabout.
It is bloody annoying if you are waiting to enter, where da cluck are these cars going to turn ? When they do work, they often stay on too long, and you think the car is coming round your bit, but no, although still indicating as though they are, they shoot off down the exit before you, by which time the next car, no indication, IS coming round your bit.
Without doubt a refund is required. Of course BMW, Audi and Merc. drivers have to watch a Video before they drive the new car away from the showroom, entitled," How to Drive like an Arsehole".