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Good for HR, Bad for Power

    This is the best device on the market for a cyclist who wants every possible piece of data on heart rate mixed into their cycling data. The altimeter actually works as well (but only on the bike - it doesn't stay on if you're off of the bike so don't try to use it climbing or skiing). The incline measurement is also a cool feature. The bad: the power monitor functions by sensing tension on the chain (in basic terms) and doens't work. If you're looking to really train with power, this won't cut the butter as sometimes it's off by several hundred watts over an interval.