After approximately two weeks life I can confirm that this model works properly and can enjoy using. It fits comfortably in your hand, the color display is easy to read, illuminated keys have a good tactile feedback and audible feedback (can be disabled), the menu is clear, the setting possibilities are endless. A major reason for my choice is to lock caller - so annoying call centers or other contemporaries can be easily dismissed and the phone remains silent. For those who know more, or want to see, I recommend youtube product video (Unboxing and Test & functions) of yogi285de. The Lord shows the device really full detail.
Finally, a small criticism: ringtones. Another reviewer wrote it already. Most ringtones are quite low and only represent some Sinnfreies Gedudel are missing simple, concise Ringtones -. I have only one really matching ringtone found. But this is also a matter of taste.
Addendum of 06/06/2014: Today the acclaimed me Gigaset has unfortunately given up the ghost. The handle turned to a loud noise dead. Even multiple battery in / out game did not make it to revive. Too Bad.
Addendum of 07/17/2014: after only 3 days the customer service of the Gigaset device came back and now works correctly. Apparently the software had crashed and was re-uploaded. Let's see how long that now holds ...