Hi Kyle, I apologize for the poor description of the screen issue. When you start your GLC the MBUX system boots on the screen giving you access to audio, info, nav, etc. and then AA/Car Play launches. While both (MBUX and CarPlay) are running you can switch/toggle between CarPlay and the MBUX screen. Today Car Play launched but would not allow me to toggle between the two making it difficult to access the MBUX settings. I had to shut the vehicle down and reboot the phone to get control again. If you read the Carlinkit FB pages, you will see nothing but issues with many complaining about the outcome of updating to OS. When initially searching for the Dongle, I did notice one being offered by Crutchfield albeit more money. I'm going to reach out to them and see about the stability of the unit they offer.