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Review title: I'm sticking to my old HRM
Product review: My ancient polar S210 needed a new battery so I decided on a long overdue upgrade. Boy was I disappointed. The rs100 seemed to have all the features I was interested in, and the price was fair, but right out of the box, it never accurately recorded my heart rate, even when I used it with my old chest strap (which has always transmitted my heartrate accurately to my S210). The only good marks I can give this whole experience was that amazon.com has a very simple return process that made this ordeal nearly painless. I have since replaced my old S210 battery and watch band and am back in business.
