I've read that it's best to get the monitors that have the strap that goes around your chest, rather than the ones that only read from your wrist... as far as accuracy is concerned.
Other than that, I don't know much about them. I'm more of a walker. 
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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