Software and Service disappointing

I have this clock my wife paid, so that they can document their training.
Although the pulse measurement is functioning properly, but the service is already used to.
Regarding the software, in particular as regards the measurement of calorie consumption, there are huge differences to my own clock (polar) and the device indicators in the studio.
Some time ago I wrote to Breuer regarding these differences, but unfortunately came no contact.
In addition, would also be mentioned that the chest strap is great need of improvement in convenience.
Overall, I am very disappointed with this purchase.