Under Armour Band and other Trackers

Options
Just curious if anyone out there has any experience with the UA Band. I would love to know how accurate they are and if they are worth the investment. I am not sure I really trust any of them as far as calorie burn goes. I tried a Fitbit and it did not work for me. It said several times when I was just resting that my heart rate was like 190! when actually it was around 75-80 bpm. I would like to know exactly how many calories I burn on top of my regular exercise, or close anyways. According to some of the studies I have done a person of my age and build burns almost 2000 calories just to stay alive. Any advice or experiences will be appreciated.