I summarize briefly and list the positive and negative points to:
POSITIVE
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-Einfachste Operation
-Long Battery life
-Cheap Price
-Sprachqualität At low speeds
-It Allows the voice control and thus the phonebook use from iPhone
NEGATIVE
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-Sprachqualität At higher speeds (from 120) rather moderate for me and interlocutor
(-colour Black: falls at my beigenen sunshade while driving repeatedly eye nat At a black sun visor perfectly..)
not keep -can generally through the small speakers with a built-on solution's car radio
In summary: Really solid speakerphone which is really worth it (1x mobile phone costs at the ear much more + points, not to mention the comfort gain all), but shows more weaknesses on the highway.
I would wish me a jack output, so I could take the speaker use the my music system.