Make sure you tell them that the hammer probably won’t work great at first, as the windows are laminated, so they are a bitch to break. You have to keep at it, in the exact same spot. I don’t love the laminated windows, it’s a gift (when broke, they stick together and dont shower the passengers with glass + they have sound/noise advantages), and a curse (they are a bastard to break when you need them to break).
There’s a lot of cars that use this same design, which I agree is annoying. I also have a Mini Cooper and it’s the exact same damn problem. It’s always a bugger to wash them too because water gets inside the window trim and then every time you open the door it smears water along the bottom and the top, because the window recesses to be closed.