I haven't heard about it being problematic, but I have heard that people just don't like it. It makes the car less responsive because every time you start from a stop the engine has to turn on again. That minor inconvenience has to be worth the extra fuel savings that you get though.
I also agree that it is a good piece of tech to separate the Dart from the 100. Heck, if its good enough for a BMW then it should be good enough for the Chrysler 100.