After a disappointing start and return service, the product is satisfactory

The Polar brand is best known athletes for training monitoring devices. A tracker is quite suitable to their catalogue.Mais that's not all ...
The product itself rather well filled office. The results are quite close to those of its competitors, at least for everyday activity, number of steps and calories burned.
But the sleep function seems just decorative.
Then, Charts, shown in a circle 24H, are difficult to read. Ergonomics is a bit fouillie.
Bluetooth synchronization is often laborious, and it takes it back at least twice.
And above all there is a very big problem with the battery, which in my case does not last more than 24 hours, instead of 6 days (on average) announced. Yet, I am only the bare minimum with the Loop !!

So we will wait for updates that could not delay. But for now (late January 2014), this is absolutely not to be compared to others.

Update 29/01: my unit is defective as the Polar bracket. Just received, I have to return it (at my expense) !!
Update 05/02: unit sent for service 31/01 and received back from the service 05/02. Very good time. Indication of change in the "Module Polar Loop", nothing more. Re-load and test the coming days.
Update 07/02: the load takes better (about 20% loss per day, instead of 100%), but curiously the measure "sleep" is even less precise than before! Already it was not great.
AND ... I add a cross (3 instead of 2) as a new updated app (1.1.1) allows better detail sleep (restless or restful) and the distance (in addition not).

Update 17/03: touyt is well and better in recent weeks. The charge finally hold at least 5 or 6 days and the results are satisfactory. I add a cross to arrive at 4. Maybe with new updates that will be even better.