Instruct: Classify the given Amazon review as either positive or negative.
Query: Inaccurate calorie burn

I found the calories burned to be WAY off. I had heard that the cardio machines overestimate calories burned, so imagine my suprise when this HRM read about 100 calories over the machines, even when I only worked out for 10 minutes. I would suggest spending a little more money and getting a Polar HRM. I retured this one and got the Polar FT4 and I LOVE it. Much more accurate and comfortable.