I have a Polar RS800 and I wear it constantly when I ride or exercise. My goal is weight loss and I have found that my body gets rid of fat better when I work out at 65% of my max heart rate. I also use it for interval training, I'm absolutely addicted to my polar. I also have a polar mounted on my bike. Sometimes I ignore the high heart rates because I'm having fun, but I pay attention to it when I want to concentrate on fat burning zone.