Two devices Ruck Zuck defective.

The first device was three days, then it could no longer be to enable and load.
The second device was already after the first connection to the PC, the error message "MTBF reported a crash."
I have to say the replacement via Amazon ran really fast. It was almost embarrassing to send back the second unit back to me.
Otherwise, the navigation itself was running quite quickly during my first device. However, the reaction of the software when you press a button, sometimes a bit sluggish. One has to feel not taken correctly or gedrück. But other than that the part looks quite chic and high quality.