I will agree that the user interface is not very well thought out. I even took my IS350 back to the dealer and had their tech guy sit in the car with me and go over a few things. It was enlightening to him to see it through a users eyes. One of my biggest peeves is when you select music source from the menu screen. It should take you to a menu of the sources available and let you choose which one you want. It does do this, but at the same time automatically switches to the next available source whether you want it to or not. It's just the state of these devices, car makers need to let the interface pros (Apple, Google, Android, etc) handle this part. Personally, I'd rather them not do anything, and just provide me with a second screen for my iPhone, it already does everything I need it to do and much more efficiently!