Ready for a twist gents...this just recently happened to my wife's 06 e53. I was driving and she was in the passenger seat. Fortunately, the shade was closed. I gotta admit, the first thing out of my mouth (after "oh sh!t" of course) was "you're lucky I was in the car babe cuz I would've never believed you". I mean come on, it just exploded? when you look at from the dealers prospective it sounds pretty bunk.
My dealer also covered it under "goodwill" like the OP but the rolling joke at the store is that I went to a Dodger game and somebody took a bat to my car cuz I was mouthing off