From the review:
"Most of the time, in my experience, the sensor will fail to read anything, resulting in a number of different error messages. Like the Eskimos with a hundred words for snow, Samsung seemingly has a hundred error messages for failure."
"As a general rule, Ive found that the heart rate while cycling was never accurate. At least, not when compared to four other heart rate monitoring devices I was wearing. All of those agreed within 1-2 BPM. The Gear Fit was about 30-100bpm off. Which, is basically the difference between telling a police officer you were going between 55MPH and 125MPH in that 25MPH school zone."
"Next, I took it running on an interval workout. Its a hard workout and thus has high intensity mixed with immediately low intensity as you alternate between running hard and the 90-second rest breaks.
I found that throughout my 8x800m workout, some of the intervals it tracked the HR fairly well, within a beat or two of a traditional HR strap:
But about half the time it was just off in left field, showing me at 80BPM when I was closing in on 180BPM. I would have loved to show you the actual heart rate data on a chart, comparing to the two. But more on why I cant do that in a minute."
"Looking at the sports angle, the optical sensor is on a good day, barely half-functional. And thus, theres really no point in using it."
What a shame, I had high hopes for this replacing my chest strap. For $199 I'd expect this to function flawlessly.