I am hiking and trail running. As I can understand from searching here and there, 935 is atm the top watch with gps, ABC, OHR, light, very good software etc. I am ready to buy it, the only think stopping me is worrying about that broken OHR problem. It seems too common to ignore. I will wear the watch only during training, not 24/7, so I may decrease the chances of the "glass" shattering. Can you help me understand really how common this issue is? I spoke with the garmin service of my country, they told me that of course it is something never happened to them.