Property me these Chest Mount bought because I have not seen too much to pay more for the original. Since the reviews have been positive on the whole, I bought this also. The build quality is great and also acts dibasic. The Chest Mount is used for mountain biking (downhill, enduro) and does exactly what it should. So far I am very satisfied.
PS: The shipping but takes a few days. For me it was about 10 days.