I've been using the FITBIT HR for close to two weeks now. This training aid is quite user friendly and so far has proved to be fairly accurate. I've taken it on runs following low lying, and mountainous trails. Most of the runs were around an hour long and fairly equal in distance according to the steps and distance logged. The heart rate monitor mode indicates how the trail terrain effected the workout, showing that an hour running in the mountain trails has more impact, bringing the heart rate up to and above the 140 pbm range. Pushing the heart rate to its peak cardio range is a great way to build up endurance.
The FITBIT HR also monitors the quality of your sleep, showing how many times you were restless and awake throughout the night. It records your resting heart rate too, which is always useful to know as an athlete. The transfer of this information all happens through a wireless connection because the FITBIT HR uses Bluetooth technology. It also comes with a 'wireless dongle' that you insert into the USB port and leave there (hopefully you have some to spare on your desktop computer) so whenever you come within 10 feet of it the data from your FITBIT can sync to the Fitbit Connect dashboard. Distance goals are adjustable through the dashboard. When you're running or walking and you reach that goal distance the FITBIT HR vibrates for several seconds to let you know that you've surpassed it.
Care and maintenance: I find I have to recharge the FITBIT HR at least once every four to five days. I have a rapid USB charger so this takes less than two hours to complete. The owners manual states that the FITBIT HR is NOT waterproof but splash proof. They don't recommend that you take it swimming or into a bathtub soak with you. I wear it around the house washing dishes, and have showered with it on my wrist, without any problems so far (might not be a good idea to take it into the shower). Wipe the underside of the FITBIT HR down (the part that makes contact with your skin) with a cloth or Kleenex after exercise. Keeping it clean will ensure more accurate readings, according to the website.
