It looks like Mercedes has figured out how to make it work properly.

I remember we first encountered it about seven years ago while shopping for VWs (we ended up getting a Toyota instead). I’ve been getting it in rental cars a lot lately, and I don’t like it. It seems like its likely to make a starter fail a lot sooner, unless they make it a lot more rugged. If I owned a car with it (that wasn’t like the Mercedes set up) I’d probably disable it.