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Originally Posted by Raekwon
There are the 3 higher models the The Charge (has time on it) and Charge HR which has a built in heart rate monitor and most of the reviews I read about that version is that it wasn't very accurate.
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I have the Fitbit Charge HR and I mainly got it for the heart rate monitor functionality. I am a runner and sick of wearing a chest strap. I don't really use the other functions though it is interesting to see all the step and sleep data over long periods of time.
I've tested it a number of times side-by-side with the chest strap and I can say that it's very accurate. The only difference is that the Fitbit is delayed. So if you're doing intervals or something, the chest strap will respond immediately with your heart rate but the Fitbit delays about 10 seconds. So can be annoying. If you're running/biking/whatever at a steady pace, which is the majority of exercise, the chest strap and Fitbit are within one or two BPM of each other. Pretty impressive really.
Actually the most annoying thing is that it's not "on" all the time. So as you're running, you have to tap the screen or push the button to wake it up and check your HR. Other than that I've found it very effective and would recommend to OP.
PS - also interesting to check it while drinking. I can basically tell how drunk I am by how high my HR has risen. Drinking is not good for the heart, I've learned.