I have been watching this quality watch for years. Literally. I finally pulled the trigger after Nike stopped releasing software updates for their watches. I am very happy that I bought this watch. It does more than I ever imagined and is more accurate than I imagined. I do a lot of stationary rowing, indoor treadmill training, treadmill running, and outdoor running. All measurements are very accurate. Even the recorded heart rate readings are accurate. The only thing that will ever be "corrupted" is the sleep data. But it probably has to do with how I sleep (hands over my head and constantly moving) and the heart rate monitor isn't on my wrist all the time. Overall I couldn't be more impressed.
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