ARE ANY OF THESE ENERGY MONITORS WORTH YOUR MONEY?

ARE ANY OF THESE ENERGY MONITORS WORTH YOUR MONEY?

Energy expenditure monitors are being aggressively marketed to the general public.  We have quite a few choices, such as, the Fitbit One, Fitbit Zip and ActiGraph worn on the belt, the Bodymedia FIT armband worn on the left arm, the Jawbone Up, NikeFuel and Basis B1 band worn on the wrist and the DirectLife monitor worn around the neck.  The cost of these physical activities measuring monitors can range from $100 to $300.  Which monitor is the most accurate?  Are these monitors worth the money?