Most helpful critical review
17 of 19 people found the following review helpful
Stopped working after 6 months
on January 12, 2010
I bought one of these as a kit to go with the Garmin Forerunner 50. It worked OK for about 6 months and then stopped working altogether. It turns on by shaking it (or walking) to get the sensor to wake up and the LED flashes to let you know it's on. Even after replacing the battery with a new one I could not get the sensor to turn on (no LED flashes, no data collected on the Garmin). I used it for about 500-600 miles of running, and it was not over-exposed to moisture (I typically run on a treadmill when it rains hard).
When it did work, it was difficult to calibrate my pace. I measured several areas where I run and no matter how many times I tried calibrating the unit to these known distances, it would give me results that were close but still an average of 10-15% off. The only time it worked really well was if you maintained roughly the same pace and stride pattern as was used when you calibrated it, and ran on the same types of surfaces. So for trail runs or tempo/interval/sprint days, it was always off. Different shoes threw it off also.
I would have given it 1 1/2 stars if that was possible. Two seems acceptable since I did get some use out of it and it did help me to work on maintaining a steady pace during my runs (even if the recorded pace was wrong).