M8 Blood Pressure Heart Rate Bluetooth Smart Bracelet, Pedometer / Sleep Monitor / Call Reminder / D worth to buy? Thanks for it if those of you who have purchased M8 Blood Pressure Heart Rate Bluetooth Smart Bracelet, Pedometer / Sleep Monitor / Call Reminder / D could share about what you think of the product. I would love any extra info, as it is quite pricey as $27.20 and I just want to know it is good before paying for it.