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One person found this helpful
Works, but not ideal
on January 3, 2013
I have owned this sensor for a bit more than a year now, and mostly it works as one would expect it to. However I often have a problem of it stopping sending speed/cadence data for a few seconds (usually 4-7 seconds), which causes my bicycle computer to stop recording all data (including power) during these few seconds (since it's recording only when speed is non-zero), which is a bit annoying.
The design lets you place the speed and cadence sensors more or less independently, which is a plus, however the mounting pads work best only if have chain stays that are more or less round. If your chain stays have some kind of angular profile (probably with small bevels), it may be hard to position the speed sensor so that it is stable enough.