In spite of this, I got the part purchased ...

Have previously compared many Tracker. The sleep measurement but convinced me to Jawbone.
Of course you have to take it off while swimming and showering. But that is in the instructions.
It measures good and sufficient genau.Das material is pleasant and it wears little disturbing.

Entering the meals is not so super. It is left after some time. But that was not relevant to me.

A big plus point is that you do not need all the latest mobile phone (Bluetooth 4.0).
Synchronization is performed via the audio connection and is fully ok.
Lightweight hangers can resolve even the layman by "redo".
After updating the app, there were small problems with the (otherwise excellent) Smart Coach. After a call to the German hotline the problem konnt but be solved. Incidentally, a very friendly and pleasant service.
Now you can discuss maturely about the APP. I mean it is clear and easy to use. All I want.
Recharging is super easy with the supplied cable. The battery charge lasts for about 5-6 days. That's OK.

Conclusion: I can not complain here really ... :-) All in all: Technology that inspires.

SUPPLEMENTARY 05/20/2015: Even after 6 months the bracelet is working properly! Had indeed expected by the Rezenzionen only 3 months ... waiting now on the UP3. They want to continue to evolve, too :-)