Fortunately speaks the clock on the chest of my ergometer and thus works perfectly, as a comparison of the measured values of heart rate monitor and ergometer shows. On a complaint I have therefore omitted, possibly a Austauschgurt would have brought improvement. But regardless of the functionality makes the belt a cheap impression and is quite hard and uncomfortable.
Otherwise, there are a few things that are better could have solved even with a simple product. Disturbing I feel especially that heart rate and training time will not be displayed at one time, but you have to switch it - quite disturbing during the run.
So overall I think a principle viable product with weaknesses, the retail price of almost 50 euros for overpriced. At a lower price can be accessed by you if you keep your expectations on the part of low.