PROSPair flawlessly with Garmin Edge 520Pretty easy to setup. Just a stretch of the rubber bands. Be patient! (the Speed on the hub is a bit hard to do, but not impossible)Never failed to work so far.Very long life in battery. Been using a year and haven't changed the battery yet. Did about 1200 miles.CONSRubber bands can break with application of chemicals to clean bike, rubbing foot, or exposure to weather. This may cause you to lose the sensor.My remedy is to put an additional black zip tie over it to really hold it in place. No problem since. Initially, the Speed sensor on the hub just popped off within 2 months of using for some weird reason (that is, the provided black rubber band failed!)4 Stars is for the poor performance of rubber band for a hold. They need to find a better solution. I recommend Zip ties. They aren't worn as easily by rubbing and are flatter. Maybe they won't stay in place, but rubber on the back of the sensor would solve that issue.I've purchased 3 of these for 3 bikes.