The biggest reason that the Armband is the most-accurate calorie/activity monitor (outside of living in a Lab), is because it has multiple sensors.
It measures "context" better than anything else available today.
Unlike the Fit Bit, the Fuel Band, HR Monitors and the Up devices (which are all single-sensor devices), the Armband has 4 sensors that work together to ensure it cannot be "fooled". These sensors not only measure movement, they measure the body's metabolic response to activity, to determine the actual calorie burn (see sensor info below). All of this was validated with real Laboratory Research, which means it is 100% evidence-based.
It might not be the most fashionable device, but it is the "Smallest, most-accurate, multi-sensor device on the market. Period."
Clients already struggle with balancing their food intake with their activities. The LAST thing they need is a single-sensor device that encourages them to eat more than they need... even if it is cheap and pretty. :)
Here's the research:
Armband Accuracy >90% across all activities:
• http://www.dotfit.com/sites/63/templates/categories/images/1783/Dev_SenseWear_article.pdf
• http://www.bodymedia.com/Professionals/Key-Publications/Abstract-presented-at-the-Annual-Meeting-of-the-ACSM-2007-New-Orleans-LA-USA
• http://www.bodymedia.com/Professionals/Key-Publications/Med-Sci-Sports-Exerc-2004-May365897-904-
Why the Armband is more accurate than HR Monitors: http://www.dotfit.com/sites/63/templates/categories/images/1783/Does_HR_Predict_EE_bm2006.pdf
Use of the Armband resulted in over 3X greater weight loss: http://www.bodymedia.com/Amazing-New-Clinical-Study-Results
