Negative I find especially the time after entering the route to the first signal: Here I am already about half a kilometer on the road until the first fix / announcement comes (it's all about the location, and the route is there already calculated) , completely useless in a strange city!
The warning for exceeding the speed limit is only visual and comes very late. I do not want all the time to look at the display; here would be at least the selection of acoustic output useful. In addition, relatively large deviation between the displayed speed and tachometer.
Right on my first tour in Switzerland, I was, despite the current map into a one-way street 2x. sent. It was also by far not the best route.
Near me there is Rimsinger egg (with multiple entrances and exits). Here the announcement is so inaccurate that I run alas stranger danger, to become the wrong-way driver when I too rely on the announcement.