Apparently programiert by amateurs ...

So the device is not even begin to be able to determine a reasonably reliable time of arrival (and display ...)!
In downtown, the device, for example is based on an average speed of 42km / h. This is in no me known German city realistic, even with "green wave" not.
Even more adventurous (and all the more painful for Navigon), the device is, however, on the highway: So I drove recently a ca 15km long section of the A100 (Berlin inner ring road). Here is throughout a speed limit of 80km / h, which is at times reduced to 60km / h. The Navigon 70 "Premium" are all known limitations (be properly shown on the display). And yet, the system expects an average speed of 75km / h (and this despite further 5km in the urban area followed with max speed 50km / h) ... Hide ???
The error, therefore, amounted to such a short distance to an impressive 11 minutes! Kudos, Navigon ...!

The Bluetooth hands-free system is also to be regarded as almost useless. Although the functionality is quite impressive, but it is for the other party even with the best reception as well as not to understand ...

Not enough, that are already sufficiently award by the system behavior described above ridicule Navigon. Moreover superfluously of not surpassing underexposed "support" the company Navigon, which did not come to fruition either (because you get to emails no reaction), or simply no equivalent for the outrageously expensive Hotline includes (demotivated and especially unskilled Employees, however, fit into the overall picture ...)!
In conclusion I can therefore in good conscience only strongly advise against both the device in special, as well as from Navigon in the general case!