 The navigation on my E300 is so full of bugs that it's risky to use it. For example, when I take a route that the car did not intend, it has trouble adjusting. After I changed my route yesterday, it told me to make a right turn (and then discovering that a right turn was not possible, told me a few seconds later to make a left turn. I strongly recommend that Mercedes fix the navigation in all 2017 E300s before someone gets killed using their navigation. Mercedes should also encourage E300 customers who have iPhones to use Apple Car Play for navigation.