Fitness Band

It seems that fitness bands are all the rage these days.  With Apple coming out with their watch, I suppose it's becoming the new next big thing, being able to monitor your daily physical activity.  These things are little bands you wear on you wrist that have motion sensors in them and monitor your  physical activity and sleep patterns. Lately, they've been coming out with newer ones that can track your heart rate as well, but don't require a chest strap.  They have a little optical sensor and light that detects minor changes in your skin which represent your pulse.   Looks interesting. I'd love to know how well they work though.  Fitbit who I guess are probably the leaders in this area have the new FitBit charge HR which I'd like to try, but it seems it won't be out till the new year.  Bad marketing as I'm sure they'll be missing out on the big sales prior to Christmas.