[on_and_off]

From what I have read, Microsoft Band heart rate sensor is useless. Too bad, once somebody delivers continuous heart rate tracking with reasonable accuracy and bulk, he will have my money.

[Spearchucker]

Yeah I followed that saga too. And I still have no idea whether the sensor is actually bad, or good. I do know that the Band samples at different heart rate frequencies depending on what it's running -

- Exercise modes (Run and Workout): Heart rate records every second

- Sleep tracking : 2 minutes on, 8 minutes off. Repeats throughout duration

- All other times : 1 minute on, 9 minutes off, and repeating the cycle

- Manual: You can force-check your heart rate at any time by tapping the Me Tile

[unfamiliar]

I've heard very good things about the Mio Link. It is already pretty small and I'm sure the technology could be miniaturised if subjected to Apple-size budgets. I think the battery life is bad though, only suitable for exercising not for continuous use, but again that could be because the technology isn't optimised to its full potential.