Can someone that has the Watch and a Polar or Garmin HRM that uses a strap, do a comparison? I've scoured the internet and not one knucklehead has done this. Not from runnersworld, Men's Health, Men's Fitness, etc. The HRM chest strap is the gold standard outside of being in the Dr's office hooked to a machine. The only way we'll know how well AW is, is to use both systems at the same time on the same run or bike ride.