I wear my X6HR in a regular environment (office, home), nothing near extreme condition. However, in less than a year, I foung the rubber band of the heart monitor is broken in many placed and the rubber became brittle with many hairline cracks. This is clearly a quality issue with the material used for the watch. In a trip to the Keys, FL, I found that the little rubber ring that holds the band of the watch in place broke in two piece much like what happed to the heart rate monitor band. The band itself also has many small cracks. I am sure the band will break in half sooner or later. The LCD on the watch also became fuzzy when I wear it around beaches. This is supposed to be a watch that you can bring to an expedition, yet it failed miserably in a everyday environment. If you are looking for a tough watch, look elsewhere. My Casio G-shock never gives me any headache that this watch gives.